90-Day Health Roadmap: Feed Your Wearable Year-End Data Into ChatGPT and Get a Prioritized Plan

What you'll learn in this article:

• Why year-end wearable data is the most valuable health input most people never use
• How to export 90 days of data from Apple Health or Garmin in under 10 minutes
• The exact prompt that converts raw health data into a prioritized 90-day plan
• What a good AI health coaching output looks like: and what to do with it
• How to build the weekly check-in that makes the plan stick

New Year resolutions built on vague intentions fail at roughly the same rate every January. "Exercise more," "eat better," and "sleep more" are intentions, not plans. A plan requires a baseline, a target, a timeline, and checkpoints.

Most people reading this have 90 days of detailed health data sitting in an app they rarely open. Apple Health and Garmin Connect track sleep duration, resting heart rate, heart rate variability, active calories, step count, and workout frequency. That data is a 90-day behavioral baseline. Combined with the long-context file analysis capability of ChatGPT-4o, it becomes the foundation for a genuinely personalized Q1 health plan.

Step 1: Export Your Data

From Apple Health: The most complete export method uses Health Export (free in the App Store). Open the app, select the date range (last 90 days), choose CSV format, and export. Alternatively: Apple Health > profile icon > Export All Health Data (creates a larger zip file with XML data; the Health Export CSV is easier for ChatGPT to read).

From Garmin Connect: Open Garmin Connect > More > Settings > Account Information > Garmin Health Data Export. Choose a custom 90-day date range and download the CSV.

ⓘ If the File Is Too Large

Files over 50MB may exceed ChatGPT's processing limits. Use Health Export to export only specific metrics: sleep, HRV, resting heart rate, and active energy are the four most useful. Export these as separate sheets or trim the date range if needed.

Step 2: Write Your Goals

Write your top 3 health goals for Q1 in specific, measurable sentences before uploading. Vague: "Exercise more." Specific: "Run 3 times per week, average 25 minutes per run, by March 31." The specificity in your goals directly determines the specificity of the plan ChatGPT produces.

Step 3: Run the Prompt

Open ChatGPT-4o, upload your CSV file, then paste this exact prompt:

THE PROMPT

"I'm attaching my health data export from [device]. My top goals for Q1 are [X, Y, Z]. Act as an evidence-based health coach, not a diagnostician. Identify the 2-3 metrics most worth improving and give me a specific 90-day action plan with weekly milestones. Flag where I should verify findings with my doctor."

What to expect: A well-configured response includes: (1) metric analysis: the 2-3 metrics from your data most correlated with your stated goals; (2) a 90-day action plan in three 30-day phases; (3) 3 habit stacks: behavior combinations that reinforce each other; (4) a stop-doing list based on patterns in your data; (5) specific doctor flags where the model identifies data points worth discussing with a physician.

Step 4: Build the Weekly Check-In

Every Sunday evening, paste this prompt into a new ChatGPT conversation:

WEEKLY CHECK-IN PROMPT

"Weekly health check-in. This week my average sleep was [X] hours, average resting heart rate was [X] bpm, and I completed [X] of my planned [X] workouts. I am now at Week [N] of my 90-day plan. Am I on track for my Q1 goals? What should I adjust or prioritize this week?"

You do not need to re-upload your data for weekly check-ins. The manual summary is sufficient for the model to track progress and flag deviations from the plan.

This information is for educational purposes only and is not medical advice. Please consult a qualified healthcare professional before making changes to your health routine.

Action Steps Summary

• Export 90-day data from Apple Health (Health Export app) or Garmin Connect: aim for sleep, HRV, resting heart rate, and active energy at minimum.
• Write 3 Q1 health goals as specific, measurable statements before uploading.
• Upload to ChatGPT-4o and paste the supplied prompt with your device name and goals filled in.
• Save the output to a Notes doc or Google Doc for reference throughout the quarter.
• Build the Sunday check-in ritual : 2 minutes weekly; schedule as a recurring calendar reminder.