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YouTubeNatal Sphere
What is the 30% rule?
Quickly learn the 30% rule for starting exercise: aim for about 30% of your heart-rate reserve (HRR) as a gentle entry point, then progress toward 40–59% HRR for moderate intensity. Includes how to calculate HRR and a simple target formula. Not medical advice—consult a clinician for personal guidance if you have health conditions or take ...
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