❤️ Heart rate zones
Find your five training heart-rate zones: enter age and resting heart rate for HRmax and zone ranges, tap along with your pulse to measure current BPM, and watch the beating heart gauge tell 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.