❤️ Heart rate zones
Find your five training heart-rate zones: enter age and resting heart rate for HRmax and the zone ranges. Tap along with your pulse to measure current BPM, and a beating heart gauge tells you which zone you're in.
Leave resting HR blank → zones use plain %HRmax instead of Karvonen.
⚠️ Educational reference — formulas are population estimates (individual HRmax varies ±10–12 bpm); not medical advice, and not for people with heart conditions without a doctor's guidance. HRmax: Tanaka 2001 (208 − 0.7 × age) or Fox (220 − age). With a resting HR the zones use the Karvonen method — target = rest + %·(HRmax − rest) — otherwise plain %HRmax. Zones: Z1 50–60% recovery · Z2 60–70% base endurance & fat burn · Z3 70–80% aerobic · Z4 80–90% threshold · Z5 90–100% maximal effort.