The best way to track fitness progress
The scale answers one question badly. Four simple measures answer the questions you actually have.
Short answer
Track four things: matched progress photos every two to four weeks, waist (and arms, chest, thighs) every two weeks, a weekly average of your morning weight, and your main lifts. Together they show whether you’re losing fat, building muscle or recomping, which no single number can.
The four measures
| Measure | How often | What it tells you |
|---|---|---|
| Matched photos (front, side, back) | Every 2–4 weeks | Shape changes the scale misses |
| Waist, arms, chest, thighs | Every 2 weeks | Where you’re losing or gaining |
| Morning weight, weekly average | Daily, read weekly | Direction of energy balance |
| Main lifts | Every session | Whether you’re keeping or building muscle |
A five-minute weekly routine
- Same morning each week, after the bathroom, before eating.
- Weigh in and note it.
- Measure your waist.
- Every other week, front, side and back photos in the same place and light.
ProgressLens does steps 2–4 in one check-in: the camera shows your last photo as a ghost overlay so every photo lines up, the measurements sit beside it with charts, and AI Analyze reads it all and tells you what changed and what to do next.
Reading the results
- Weight down, waist down: losing fat.
- Weight flat, waist down, arms up: recomposition.
- Weight up, waist flat, arms up: lean bulk going well.
- Weight up, waist up fast: surplus too big.
FAQ
Frequently asked questions
What is the best app to track fitness progress?
For body changes, an app that lines up your photos, keeps measurements beside them and tells you what changed, such as ProgressLens. For workouts, a lifting log such as Hevy or Strong.
Should I track body fat percentage?
Optional. Waist and matched photos show the same trend more reliably than most home body fat readings.