To start to accumulate Strain, you need to reach 30% of your Heart Rate Reserve. Your Heart Rate Reserve is the range from your resting HR to your max HR. For example, if your max is 200 and resting is 50, you have a 150 bpm reserve, so 30% of your HRR would be 95 bpm, or 50 + 0.3 * (200-50).
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