A monthly gym newsletter needs five parts: one headline update, any timetable or hours changes, a coach tip or member story, what is coming up and a single action. Paste your rough notes into ChatGPT or Claude with a fixed prompt, check every fact in the draft, and a month of scribbles becomes a finished email in one short sitting.
Most gym newsletters fail at the notes stage, not the writing stage. An assistant can only polish facts you give it, and when you give it none it invents some, which is how a member ends up reading about a sauna you do not have. Keep a running notes file during the month, and paste it in on the same date every month.
The notes file: what to jot down during the month
A phone note or a shared document is enough. Add a line whenever something happens, in whatever shorthand you like, under five headings.
- What changed. Timetable moves, opening hours, new kit, price or policy changes, with exact days and times.
- What happened. A milestone, an event or a community moment, with any figure taken from your member system.
- People. A coach's tip in their own words, a new team member, or a member story you have written consent to share.
- What is coming. Dates, events and offers that are decided, not hoped for.
- The one action. The single thing you want members to do: book a class, reply, bring a friend.
Real notes are messy, and that is fine. "Tues HIIT to 7, coach asked", "2 new cable machines by the racks" and "Spin Thurs lunchtime dead, cancel?" are all usable, because the prompt below tells the assistant what to do with fragments and with gaps.
The prompt that turns notes into a draft
You are writing the monthly member email for [gym name], an independent gym. Voice: friendly, plain, a little dry; short paragraphs; no exclamation marks except in the sign-off. Match the two sample emails below.
STRUCTURE: five subject line options; preview text under 90 characters; a one-sentence opening; then in order: 1) the headline update, 2) timetable or hours changes as a short list, 3) a coach tip or member story, 4) what is coming, 5) one call to action. Under 280 words.
FACTS: use only the notes below. Do not add any date, time, price, class, person, equipment, quote or claim that is not in the notes. Where a note is vague, write [CHECK: what is missing]. Give no health or training advice beyond what the coach's note says.
NOTES: [paste the month's notes]
SAMPLE EMAILS IN MY VOICE: [paste two]Each part earns its place. The structure line keeps every issue the same shape, so members know where to look. The facts block and the [CHECK] rule turn the assistant's invented details into visible questions. The sample emails carry your voice better than any adjective. The word limit forces choices, and the ban on health advice keeps the assistant inside your notes. Run it on a free plan or a paid one; the thing that matters is that you read the result against the notes before it goes anywhere.
Example 1: January, when the timetable changes
January issues are practical: new members arrive and the timetable moves. Here are the owner's notes as typed on a phone during December. Everything is illustrative, with placeholders where a name or date would go.
closed 25 and 26 Dec, open 10 to 2 on 1 Jan. new timetable first full week of Jan: Tues HIIT moves 6:30pm to 7pm (coach asked), new Sat 9am Strength Basics for beginners, Thurs lunchtime spin cancelled (usually 3 people). 2 new cable machines by the squat racks, arrived 12 Dec. coach tip: first 4 weeks, 3 sessions a week is plenty, book them in like appointments. 6 week Starter Programme starts 2nd week of Jan, 8 places left, $60 for members. each member gets 2 guest passes in Jan. action: book Strength Basics Saturday.
With the prompt above, the assistant returned five subject lines and a draft. After the edits listed below, the email sent in the third week of December read like this. The subject line chosen was "Your January timetable, and a place to start", with preview text "New Saturday class, two new machines and your guest passes."
Hello [first name], here are the holiday hours, what changes in January and one easy way to start the new year.
New on the floor: two new cable machines, next to the squat racks. And on Saturdays at 9am there is a new class, Strength Basics, built for anyone new to lifting or coming back after a break.
Timetable changes from the first full week of January: Tuesday HIIT moves from 6:30pm to 7:00pm. Thursday lunchtime Spin is cancelled. New: Saturday 9am Strength Basics. Over the holidays we are closed on 25 and 26 December, open 7am to 7pm from 27 to 31 December and open 10am to 2pm on 1 January.
A tip from [coach name]: "For the first four weeks, three sessions a week is plenty. Book them in like appointments, on the same days each week."
Coming up: the six-week Starter Programme begins in the second week of January. It is $60 for members and there are eight places left.
One thing to do: book your place at the first Strength Basics on Saturday [date]: [link]. Every member also gets two guest passes in January, so bring a friend. See you in the gym, [your name]
The first draft had four faults and one useful flag, and each is typical of what assistants do to a notes file.
- It opened with "Smash your January goals". That is not this owner's voice, and nothing in the sample emails sounds like it, so it went.
- It changed the HIIT time to 7:30pm, apparently rounding "7". Always compare times and dates with the notes character by character.
- It added "plus access to our new sauna", which the gym does not have.
- It wrote "limited spaces" where the notes said eight places left. Specific numbers beat adjectives, so the number went back in.
- It flagged [CHECK: opening hours between 27 and 31 December], which was exactly right: the owner had never written them down. The real hours went in.
The [CHECK] marker is the most useful line in the prompt. It turned a gap that would have become an invented sentence into a visible question. For the January offer this issue announces, see the January marketing plan with offers, emails and posts.
Example 2: summer, when half the team is away
Summer issues are about cover, comfort and holidays, and they should be shorter. The structure changes slightly: the changes lead, because that is what members need.
Aug: [coach] away 3 weeks, Mon and Wed 6am classes covered by [coach 2]. Fri HIIT paused 3 weeks [dates]. hours unchanged. heat: 2 extra fans in studio, back door open 2 to 6pm, water refill by desk, bring a bottle. outdoor class Sat 8am for 4 weeks, weather permitting, moves inside if wet, call made by 7am on Insta story. pause requests via the app by the 25th for next month. member milestone: [first name] hit 100 visits, consent given. quietest times 10 to 12 and 2 to 4. action: pause by the 25th if away, otherwise try the outdoor class.
The chosen subject line was "Summer at [gym name]: cover, cool and an outdoor class". The email as sent:
Hello [first name], a short one this month, because August is mostly about who is covering what.
Changes: [coach name] is away for three weeks, and [coach 2] covers the Monday and Wednesday 6am classes. Friday HIIT is paused for three weeks: [dates]. Opening hours do not change.
Keeping cool: we have added two extra fans in the studio, the back door is open from 2pm to 6pm and there is a water refill point by the desk. Please bring a bottle.
Outdoors on Saturdays: for four weeks the 8am class meets outside, weather permitting. If it rains it moves indoors, and we will say so on our Instagram story by 7am.
Away on holiday? Pause requests need to be in the app by the 25th for the following month.
A milestone: [first name] reached 100 visits this month. Well done.
If you like space: 10am to noon and 2pm to 4pm are our quietest times. One thing to do: pause by the 25th if you are away, or try the outdoor class: [link]. [Your name]
The slips this time were different, which is why the check has to be a habit and not a one-off.
- It described "air conditioning". The notes say fans, and a member who turns up expecting cold air will remember it.
- It said the pause deadline was the 15th. The notes say the 25th, and a wrong deadline creates real disputes.
- It added free sunscreen at the desk. Nothing in the notes mentioned it.
- It wrote "beat the heat" twice and "scorching summer" once. Both went, because the owner's voice is dry, not breathless.
- It correctly left the Friday HIIT dates as [CHECK: dates of pause], which the owner filled in from the rota.
The member milestone deserves a note of its own. The line is only there because the notes record that consent was given and the visit count came from the member system. Ask for permission in writing, even by text, before naming anyone, and never let an assistant produce the milestone or the member from nothing.
Example 3: the anniversary issue, built around thanks
An anniversary email invites members to read every line, so a single invented fact does the most harm. The notes below mix figures from the member system with the owner's own decisions, including a decision not to discount.
5 years on [date]. opened with 40 members, now 410 active (system, [date]). 1,100+ different people have trained here in 5 years (system export). thank coaches, desk team, cleaners. anniversary Saturday: free community class 10am, friends and family welcome, cap 30, book via [link]. 2 guest passes per member all week. no sale, would rather keep prices fair. next: Sunday hours extend to 8 to 6 from [date], decided. ask: reply with a one-line memory or a photo if happy to share, I will read every one.
The subject line chosen was "Five years, and thank you", with preview text "An open class on Saturday, and two guest passes each." The email as sent:
Hello [first name], five years ago this month we opened the doors with 40 members and a lot of nerves. Today there are 410 of you training here, and more than 1,100 different people have trained with us since [date].
Thank you. To the coaches who turn up for the 6am classes, the desk team who know your name and the cleaners who keep the place the way you like it: this gym is made of people, and we know it.
How we are marking it: on Saturday at 10am there is a free community class, open to friends and family. Spaces are capped at 30, so please book at [link]. All week, every member gets two guest passes. There is no sale: we would rather keep our prices fair for everyone than discount them for a week.
What is next: from [date], Sunday opening hours extend to 8am to 6pm.
One favour: reply with a one-line memory of your time here, or a photo if you are happy for us to share it. I will read every one. Thank you for the last five years. [Your name]
The edits here guard against the assistant's worst habit.
- The first draft included a quote, "Best gym I have ever joined", attributed to "a member". It was not in the notes. An invented testimonial in an email to people who may know every member is a trust problem and may break advertising rules, so it was deleted.
- It added "as seen in the press". Nothing in the notes said so.
- It wrote "over 1,000 members" where the notes give 410 members now and more than 1,100 different people overall. Those are different numbers, and the system export is the source.
- It slipped in "huge anniversary discounts" against the owner's decision not to discount.
- It dropped the cap of 30 on the community class. Without it, the owner could have had 60 people turn up.
Subject lines and preview text: five options, one choice
The prompt asks for five subject lines so that you have options to choose between. For the January issue the assistant offered these, and the verdicts show how to choose.
| Option | Verdict |
|---|---|
| Your January timetable, and a place to start | Chosen: it names the content and offers something to do |
| What is new at [gym name] this month | Safe, but members have seen it a hundred times |
| New Saturday class for beginners | Specific, but ignores the timetable changes that affect everyone else |
| Three sessions a week is plenty: your January plan | Strong if the coach's tip is the heart of the issue |
| January at [gym name]: timetable, new kit, guest passes | Accurate, but reads like a contents page |
The rule behind the choice is simple: a subject line should promise only what the email delivers. Write the preview text last, because it is the second line members see on a phone, and make it add a fact, not repeat the subject. If your list is a few hundred people, do not read much into split tests of two subject lines, because a handful of opens in either direction is noise.
Which tool sends it, and where the free plans stop
Check first whether your membership software already sends email to members, because it may. If not, any of the usual tools will do the job, and the question is which free plan your list outgrows. These are list prices in USD, read from each vendor's pricing page on 28 October 2026.
| Tool | Free plan limit | First paid step | A 400-member list |
|---|---|---|---|
| Mailchimp | 250 contacts, 500 sends a month, 250 a day, Mailchimp branding on emails | Essentials from $13 a month at 500 contacts | Needs the paid plan |
| MailerLite | 250 subscribers and 2,500 emails a month, three automations | Comfort $12 a month, or $10.80 billed yearly, up to 500 subscribers | Needs the paid plan |
| Brevo | Up to 300 emails a day; its page does not make the contact limit clear, so check before signing up | Starter from $9 a month, or $8.08 billed yearly, with the logo removal as an extra | Check the free plan's contact limit |
Plan tiers and contact limits change, so use these as a guide to the questions to ask. For a wider comparison, see newsletter sending tools for small businesses, and writing a customer newsletter with AI for the general method.
Save the prompt and your two sample emails in a project on your assistant, such as a ChatGPT Project or a Claude Project, so each month you only paste the notes. Keep member names and addresses out of it: the assistant needs your notes, and your email tool handles [first name] when it sends.
A monthly rhythm for the notes, the draft and the send
The whole job fits into four short moments, and only one of them involves the assistant. The times are my estimates for a small gym, and yours will vary.
| When | Task | Rough time |
|---|---|---|
| All month | Add a line to the notes file whenever something changes or happens | Two minutes a note |
| Three days before the draft | Ask each coach for one tip and the desk team for the three questions members asked most | 10 minutes |
| Draft day | Paste notes and sample emails into the saved project, run the prompt, read the draft against the notes | 20 minutes |
| The day before sending | A second person checks every date and time, you test on two phones and schedule it for the same weekday as last month | 20 minutes |
Some months little happens. Do not let the assistant fill the gap with news. Send a shorter issue with the timetable, one coach tip and the one action, and say less. A member who gets a brief, true email learns that your emails are worth opening, and an inflated one teaches the opposite. If a month has too much to say, move the overflow to a page on your website and link to it, so the email stays readable.
Checks before you press send
- Compare every date, time and price with your timetable and price list, one line at a time.
- Search for any remaining [CHECK] marker and for words such as "limited" or "exclusive" that you did not write.
- Send a test to two addresses and open it on a phone, where most members will read it.
- Click every link and the unsubscribe link.
- Confirm the reply-to address goes to an inbox someone reads, because members will reply.
- Keep the email short: Gmail clips messages over 102KB, and an unsubscribe link below the clip is a problem.
- Watch spam complaints. Google asks bulk senders to keep their reported spam rate below 0.10% and never let it reach 0.30%; a gym's list is far below the bulk threshold, but the same ceiling is a fair target.
- Run the wider checklist in the email newsletter QA checklist if you want a longer one.
Afterwards, look at clicks, replies and bookings, not opens. Apple announced in 2021 that Mail Privacy Protection helps users prevent senders from knowing when they open an email, so open counts overstate how many people read. Give the call to action its own link, count the clicks, and ask new members how they heard about the class. Those three numbers tell you whether the issue worked, and they cost nothing to collect. When the issue lands well, the same notes feed your other channels: a post for each section, and an automated message in the gaps, as in automated check-ins for gym members.
Gym newsletter questions
How long should a gym newsletter be?
Long enough to carry the five parts and short enough to read on a phone in about a minute. The examples above run under 300 words. If you need more, link to a page for the detail, such as the full timetable, and keep the email itself to the headline, the changes, one tip, what is coming and one action.
How often should a gym send one?
Monthly suits most gyms, on the same weekday so members learn when to expect it. Send extra emails only for real news, such as a closure or a timetable change. A short extra message about something that matters is welcome, while a weekly newsletter with nothing to say teaches members to ignore you.
Can AI write member stories or testimonials?
No. It will invent people, quotes and results, which is a trust problem and may break advertising rules. Use real members' own words with their written consent, and let the assistant tidy spelling and layout only. The same applies to figures such as visits or years open: take them from your system.
Do I need members' permission to email them?
Operational messages such as a cancelled class are different from promotional newsletters. Make sure members agreed to marketing email, put a working unsubscribe link in every issue and honour it quickly. If you are unsure what your sign-up wording allows, ask a data-protection adviser before you send.
Further reads
- Gym Referral Programme: Set Rewards and Test the Maths With AI — Add a referral message to an issue once the reward maths works.
- Fitness Studio Emails: Welcome, Waitlist and Lapsed-Member Sequences — Welcome and lapsed-member sequences that sit between issues.
- Gym Membership Price Increase Letter: Draft and Test It With AI — Announce a price change in its own letter, not inside an issue.
- AI Nutrition Advice at a Gym: What Is Safe to Offer Members? — A gym-owner policy for AI nutrition content: general information versus personal advice, safe claims, disclaimers and referral triggers to a dietitian.
- AI for Gym Owners: Five Jobs to Hand Over First and Two to Keep — Enquiry replies, trial follow-up, class messages, posts and drop-off nudges go to AI first. Injuries, billing disputes and cancellations stay with a person.
- AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.
Sources: Mailchimp, MailerLite and Brevo pricing pages (USD, checked 28 October 2026); Apple's 2021 announcement of Mail Privacy Protection; Google's email sender guidelines and Gmail's message clipping limit. The three issues are illustrative and use placeholders for names and facts.