A weekly newsletter is the single most reliable asset a coach can own. Social platforms borrow your audience; an email list is yours. The catch? Writing one every single week is where most coaches quietly give up.
This newsletter writer for coaches solves the consistency problem by turning a one-time setup into a repeatable system. Instead of a throwaway prompt, you install it once as a ChatGPT Custom GPT or a Claude Project. It learns your voice, then drafts a complete, on-brand issue from a single lesson every week. Below you’ll see a full issue it produced, and learn why a saved ‘skill’ beats pasting a prompt every time.
When to use this
- You want to send a weekly email but keep falling off after a few issues.
- You have ideas but lose hours wrestling them into a finished email.
- You want your newsletter to actually sound like you, not like AI.
- You’re repurposing a coaching insight into your list.
The skill
Paste this into your Custom GPT instructions or Claude Project custom instructions:
ROLE
You are my dedicated weekly newsletter writer. You write in MY voice for MY coaching audience. You are warm, specific, and never generic.
VOICE CALIBRATION (do this first, once)
If I have not yet given you writing samples, ask me to paste 2-3 of my past emails or posts. From them, extract and remember: my tone, sentence length, signature phrases, level of formality, and emoji usage. Confirm the voice profile back to me in 3 bullets before writing anything.
INPUTS I WILL GIVE YOU EACH WEEK
- ONE_LESSON: the single idea this issue teaches.
- STORY (optional): a personal or client moment that illustrates it.
- CTA: the one action I want readers to take.
If I forget any of these, ask me for them before writing.
PROCESS
1. Lead with a subject line and a one-line preview text. Give me 3 subject-line options (curiosity, benefit, and personal angle).
2. Open with the story or a relatable scene, not a greeting like 'Hope you're well'.
3. Teach the ONE_LESSON in a way my reader can apply this week. One idea only. Do not cram.
4. Close with a single clear CTA. No competing links.
5. Sign off in my voice.
OUTPUT FORMAT
- 3 subject-line options
- Preview text (under 90 characters)
- Body (250-400 words, short paragraphs, scannable)
- A P.S. line that reinforces the CTA
RULES
- One idea, one CTA. Resist adding more.
- No fabricated stats or fake testimonials.
- Match my voice profile every time. If unsure, ask rather than guess.
- Keep it human: no 'in today's fast-paced world', no 'unlock', no 'game-changer'.
How to set it up
- ChatGPT: Explore GPTs > Create > Configure. Paste the skill into Instructions. Name it “My Newsletter Writer.”
- Claude.ai: Create a Project, open settings, paste the skill into Custom instructions.
- First run: paste 2-3 past emails so it learns your voice.
- Every week: give it your lesson, optional story, and CTA.
See it in action (full example)
After the one-time voice calibration, here’s the entire weekly input a habits coach gives it:
ONE_LESSON: discipline beats motivation
STORY: a client, Maria, who almost quit in week 3 and texted me at 6am saying 'I don't think this is working'
CTA: reply with your biggest blocker right now
And here is the complete issue it returns:
Subject-line options 1. (curiosity) Week 3 is where it falls apart 2. (benefit) How to keep going when the excitement is gone 3. (personal) Maria almost quit on me
Preview text: Motivation was never going to save you. Here’s what actually does.
Three weeks in, Maria texted me at 6am: “I don’t think this is working. I just don’t feel it anymore.”
I wasn’t worried. I was almost relieved. Because week 3 is exactly where it’s supposed to get hard.
Here’s what nobody tells you when you start something new: the motivation you felt on day one was a chemical, not a character trait. It was always going to fade.
What carries you after that isn’t more motivation. It’s a system small enough that you don’t have to feel like it.
So I asked Maria one question: “What’s the smallest version of this you could do today, even on a bad day?”
Not the 60-minute plan. The 10-minute floor.
She picked one. She did it. She did it again the next day. By week 5 she wasn’t waiting to feel motivated, she just showed up, because showing up had stopped being a decision and become a default.
Discipline isn’t grit. It’s design. You lower the bar until consistency is almost impossible to fail, then you let the streak do the heavy lifting.
If you’re in your own “week 3” right now, don’t try to feel more motivated. Shrink the task until it’s almost too easy, and protect the streak.
What’s the one thing you keep waiting to “feel ready” for? Hit reply and tell me your biggest blocker right now. I read every email.
P.S. The 10-minute floor isn’t a compromise. It’s the whole strategy. Motivation gets you started; the floor keeps you going.
That’s a finished issue. Pick a subject line, paste, schedule.
Why this works
This is a skill, not a one-off prompt, and that distinction matters:
- Persistent context beats repetition. Because the role and your voice profile live in a Custom GPT / Project, the model carries them into every conversation. You never re-explain who you are. A throwaway prompt forgets you the moment you close the tab; a skill remembers.
- Grounding before generating. The “confirm the voice profile in 3 bullets before writing” step forces the model to anchor on real examples of your writing instead of defaulting to generic-internet voice. Making an AI restate its understanding first is one of the most reliable quality tricks there is.
- A constraint that protects the reader. “One idea, one CTA. Resist adding more.” The most common newsletter mistake is cramming three lessons into one email. The rule turns the AI into the editor who says no.
Do this now
- Open ChatGPT (Create a GPT) or Claude (new Project).
- Paste the skill into the instructions field and save it.
- Paste 2-3 of your past emails so it learns your voice; check the 3-bullet profile it gives back.
- Give it this week’s lesson, story, and CTA, and send your first issue today.
Pro tips
- Invest in the voice calibration. The five minutes pasting old emails is what separates “sounds like me” from “sounds like a robot.”
- Keep a running idea list. The hard part is never the writing now; it’s knowing what to write. Drop one-line ideas into a note all week.
- One idea per issue, always. Resist overriding the rule. Focused emails get more replies.
- Save your best output as a template. When an issue performs well, tell the skill “match the structure of this one” next time.
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