Blog

Sports science made practical — no fluff, just what to do with your data.

What Is ACWR and How the Load Ratio Protects You From Injury

August 08, 2026

ACWR is the acute-to-chronic workload ratio. Learn the safe zone of 0.8–1.3, the danger above 1.5, and how sudden load spikes predict injury and overtraining.

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Readiness Explained: How Your Body Tells You to Train or Rest

August 08, 2026

Readiness scores recovery from HRV, resting heart rate and sleep. Learn why a personal baseline beats population norms and how to act on a low or high score.

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Heart Rate Zones by Karvonen: How to Calculate Your 5 Zones and Train in Them

August 08, 2026

Calculate your heart rate zones with the Karvonen formula using resting HR and heart-rate reserve. The 5 training zones, the 80/20 rule, and the grey-zone trap.

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Signs of Overtraining: How to Catch It Before You Crash

August 08, 2026

Early signs of overtraining: rising resting heart rate, falling HRV, poor sleep, stalling performance. How to tell overreaching apart and what to do.

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