Whoop performed best of all six trackers with 99% accuracy for heart rate. Along with Aura and Somfit, Whoop performed the best for accurately measuring the different stages of sleep overnight. I've partnered with Whoop to offer listeners a free one month subscription to help you sleep better, recover faster and train smarter. To try Whoop zero cost for 30 days, head to the proof.com forward slash friends page.

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