每周至少计划做三次30分钟的力量训练。
Schedule 30 minutes of strength training exercise at least three times per week.
每周两至三次、每次20至30分钟的力量训练对大多数人来说已经够了。
Two to three strength training sessions a week lasting just 20 to 30 minutes are sufficient for most people.
30到40分钟的力量训练是最佳的选择，如果你打算优化那些空闲时间的短脉冲，你可以做一些10分钟的锻炼。
30 to 40 minutes of strength training is optimal; however, you can fit some exercises in as little as 10 minutes if you're prepared to optimize those short bursts of free time.
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