Muscle Gain Tracker
Log lean mass weekly to a spreadsheet and watch it climb as your training progresses.
Your total weight minus fat — this includes muscle, bone, water, and organs.
Your total weight minus fat — this includes muscle, bone, water, and organs.
Unit: kg
Lean mass is the number that matters when building muscle. Track it alongside body fat to see if your training and nutrition are working.
HC Webhook sends lean body mass readings to any webhook — here are ideas to get you started.
Log lean mass weekly to a spreadsheet and watch it climb as your training progresses.
Chart lean mass, body fat, and total weight together in Grafana for the full picture.
Email a monthly body composition summary highlighting lean mass gained and fat lost.
Monitor lean mass changes week over week to ensure you are gaining muscle on a bulk or preserving it on a cut.
Pair lean mass data with workout data in Notion to correlate training volume with muscle growth.
Send a notification when your lean mass crosses a personal milestone.
HC Webhook posts a JSON object containing a lean_body_mass array to your endpoint on every sync.
{
"timestamp": "2026-04-15T07:30:00Z",
"lean_body_mass": [
{ "kg": 64.2, "time": "2026-04-15T07:30:00Z" }
]
}Google Health Connect stores your lean body mass data from compatible apps (Samsung Health, Fitbit, Garmin, and more). HC Webhook reads that data on a schedule you set and forwards it as JSON to any URL you add — n8n, Home Assistant, Zapier, or your own API.
Install HC Webhook and grant Health Connect permission for Lean Body Mass.
Paste your webhook URL — Home Assistant, n8n, Zapier, or any endpoint.
Set your sync schedule. Lean Body Mass readings arrive automatically, every time.
Steps
Your total step count for the day, recorded by your phone or wearable.
Learn moreSleep
How long you slept and your sleep stages — light, deep, and REM — from the night before.
Learn moreHeart Rate
Your heart rate readings taken throughout the day by your phone or wearable.
Learn moreHeart Rate Variability
How much time varies between your heartbeats. Higher HRV generally means better recovery and lower stress.
Learn moreFree Android app. No account required. Data stays on your device.