YUTHI Calculator · Sport · Endurance
Training Zones
Five heart rate zones, five different training effects. Knowing all the zones and using their function lets you train more efficiently and healthily. Choose your method and see your zones instantly.
Continue in the app
That was the snapshot. The app turns it into daily support.
Measure every day instead of calculating once: Vito or Vita puts your numbers in context, builds you a weekly plan and speaks up when something stands out.
Soon on theApp Store
Soon onGoogle Play
Launching at the end of 2026 — iPhone first, Android to follow. Let me know when it’s out ↓
Your 5 heart rate zones
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Polarized training: many longevity experts recommend 80 % of training time in zone 2 and 20 % in zone 4/5 – little in the “grey zone” 3.
Heart rate zones are a supporting structure. With experience, you sense the zones through breathing, ability to talk (talk test) and perceived exertion (RPE) – often more precise than any pulse measurement.
Methods: % HRmax (simple): zone X = X % × HRmax. Karvonen (more precise, accounts for fitness level): zone X = HRrest + X % × (HRmax − HRrest). · Source: Karvonen MJ, Kentala E, Mustala O. The effects of training on heart rate. Ann Med Exp Biol Fenn. 1957;35:307–315.