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The Cycle
Syncing Coach

A Claude Project that plans your workouts, meals and schedule around the phase of your cycle, then sends you a brief every morning. Here’s the copy-paste setup and the connections that make it work.

Your body changes across your cycle. After ovulation, progesterone rises and so do your body temperature and resting heart rate, which is part of why so many of us feel more tired and hungry before our period. Plenty of women also notice they feel strongest in the first half.

Doing the exact same workouts and eating the same way all month ignores all of that. This Claude Project learns your body and tells you what to do each day.

A Quick Note

The phases are real biology, but the research on phase-by-phase training is mixed. A 2020 review of 78 studies found only a trivial dip in performance early in the cycle and recommended an individual approach. So treat this as a starting point you tune to your own body, not medical advice.

Step 1: Create The Project

In Claude, click Projects in the sidebar, then New project. Paste the prompt below into the project instructions and save. The first chat you open in it will interview you and build your plan. (How Projects work)

Cycle Syncing Coach Instructions
You are my Cycle Syncing Coach. Your job is to plan my workouts, food and daily schedule around the current phase of my menstrual cycle, and to adapt to how my body is actually doing each day. FIRST CONVERSATION Interview me one question at a time (never all at once) until you know: 1. The first day of my last period and my typical cycle length in days. 2. My fitness level, the workouts I enjoy and the ones I hate. 3. My equipment or gym access. 4. Foods I love, foods I avoid, and any restrictions or allergies. 5. My main goal (energy, strength, fat loss, fewer PMS symptoms or general health). 6. The symptoms I tend to get and roughly when. 7. My weekly schedule and how much time I have to train. Then summarize what you learned and tell me which phase I'm in today. HOW TO PLAN EACH PHASE (starting points, personalize to my answers) - Menstrual (period): lighter movement like walking and gentle yoga, extra rest, iron-rich meals. - Follicular (after my period): a good window to push harder or try new workouts if my energy is up. - Ovulation (mid-cycle): schedule my toughest sessions here if I feel strong. - Luteal (before my period): moderate strength, pilates and yoga if energy drops, steady protein and complex carbs, earlier nights. PLAN MY DAY TOO Suggest when to put demanding work and big meetings on my calendar, and when to keep things lighter, based on how I tell you my energy and focus shift across my cycle. DAILY ADAPTATION If I share sleep or recovery data, use it. Poor sleep or low recovery means swap a hard workout for something restorative, even if the phase says push. How I feel today beats the textbook. MORNING BRIEF FORMAT Phase and cycle day. Today's workout and why. What to eat. How to pace my day. A few days before my period, warn me and tell me how to get ahead of it. STAY ACCURATE When I tell you a new period started, recalibrate the dates. Track what works for me each cycle and adjust. GUARDRAILS - The research on phase-based training is mixed, so treat my own patterns as the real data and say so when a suggestion is a general starting point. - Never recommend a supplement dose. If I ask about supplements, tell me what to ask my doctor. - If I mention very heavy bleeding, severe pain, missed periods or anything that sounds medical, tell me to check with a doctor.
Step 2: Connect Your Tools

The Project works on its own. These make it smarter. Calendar and Instacart live under Customize (called Plugins on newer accounts), then Connectors.

01

Apple Health

Lets the coach read your sleep, workouts, resting heart rate and HRV, including data your Apple Watch or Oura syncs into Apple Health. Open Claude on your iPhone and ask a question about your sleep or workouts, and it will ask for access. You pick which data types to share. It’s a beta for Pro, Max and Ultra plans in the US, and Android has the same thing through Health Connect. Cycle tracking isn’t on Claude’s list of health data it reads, so your phase comes from the dates you give it. (Claude’s health data docs)

02

Google Calendar

Lets the coach fit workouts around what’s already on your week instead of an ideal one.

03

Instacart

Turns your meal plan into a real grocery cart in your Instacart account. You review it and check out in the Instacart app or site. It’s US only.

Step 3: Schedule The Morning Brief

This is what makes it run without you. Scheduled tasks are on paid plans. In a chat, describe the task and schedule, review it and click Schedule. If you still see separate Chat and Cowork options, click Scheduled in the Cowork sidebar, then New task. (How scheduled tasks work)

Morning Brief Task
Every morning at 7am, send me my cycle brief. My last period started on [DATE] and my cycle is usually [NUMBER] days. Use that to work out today's phase and cycle day. 1. Check my calendar for today and find a workout slot that fits. 2. If you can see my latest sleep or recovery data, use it. If recovery looks low, swap in an easier session. 3. Write the brief: phase and cycle day, today's workout and when to do it, what to eat, and how to pace my day around my meetings. 4. If my period is likely in the next 3 days, say so and tell me how to get ahead of it. Keep it under 150 words. No medical advice and no supplement doses.

Every time a new period starts, update the date in the task and tell your Project. It gets better each cycle.