他规定自己每周至少锻炼三次。
He disciplined himself to exercise at least three times a week.
如果没有定期锻炼，那么你可能需要每周至少伸展三次来保持柔韧性。
If you don't exercise regularly, you might want to stretch at least three times a week to maintain flexibility.
医生建议每周至少进行三次最少30分钟的心血管锻炼。
Doctors recommend 30 minutes of cardiovascular exercise three times a week at the bare minimum.
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