TRIMP turns your heart rate during a workout into a single number representing training stress — helping you balance load and recovery without guesswork.
The variation between heartbeats — your nervous system's report card.
Two metrics, one number. Why Pulse shows both — and which to watch.
Training-impulse: your weekly training load, in one chart.
TRIMP = Duration × Average HR × Intensity Weighting. The higher your heart rate relative to max, the more stress each minute contributes to your daily score.
After a session, open Pulse Rate and record your workout duration. The app uses your heart rate zones to calculate a TRIMP score automatically.
Review your weekly TRIMP totals in the trends view. A sustainable training week typically shows gradually increasing load with planned lower-load recovery days.
When your weekly TRIMP spikes significantly, your body needs more time to adapt. Use the morning HRV reading to confirm readiness before your next hard session.
The same chart that lives on your iPhone's Progress screen — rebuilt so you know what you're looking at.
Outstanding score. Your key heart metrics are above normal.
Most healthy adults fall within this range.
Not necessarily alarming — but worth monitoring.
If this persists, please consult a healthcare professional.
TRIMP = duration × intensity. A 60-minute easy run scores about 70 TRIMP. A 30-minute interval session scores 110. Pulse adds them up daily and tells you when your week is too light, just right, or about to overcook you.
You've already got the hardware — your iPhone. Pulse does the rest.
Free to download · Core tracking always free · iOS 15+