They say that your heart rate should be at 90%-100% for certain intervals, but is it safe to start of right away from rest to get to this ?
What is a safe time to get to 90% of your max heart rate ?
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They say that your heart rate should be at 90%-100% for certain intervals, but is it safe to start of right away from rest to get to this ?
What is a safe time to get to 90% of your max heart rate ?
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