Layna Tools

Free fitness calculator

Heart Rate Zones Calculator

Estimate training zones for conditioning, recovery and endurance work.

Uses estimated max heart rate and heart-rate reserve. Chest strap data is more accurate.

Training zones

Lower zones help recovery and aerobic base. Higher zones improve conditioning but create more fatigue.

Reality check

Wrist sensors and formulas are imperfect. Treat this as a guide, not gospel.

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