运动强度和运动持续时间决定其运动负荷。
The exercise load was decided by the intensity and duration of exercise.
对有氧运动是有效的，它必须是持续时间长。
For aerobic exercise to be effective, it has to be long duration.
当你适应后，缓慢增加运动的强度和持续时间。
Slowly increase the intensity and duration of your exercise as you become more fit.
当你适应后，缓慢增加运动的强度和持续时间。
Slowly increase the intensity and duration of your exercise as you become more fit.
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