Conclusion: It was suggested that the alternating load strength training could obviously effectively improve the effects of the muscular strength.

结论：交变负荷力量训练法能有效地提高肌肉力量训练的效果。

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Pyroelectric detectors depend upon alternating signal, based on which a new kind of laser training system was developed, and the problem of direct light was solved.

热释电探测器为交变信号检测器件，根据这一原理，研制了一种新的激光训练系统，完全解决直射光的问题。

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Interval training involves alternating periods of moderately intense exercise that last one to three minutes with short, more intense exercise periods lasting from 30 seconds to a minute.

CNN: Is a shorter but harder workout better?

So by alternating doing a weight training workout one day in the gym, then going for a walk the next day, you can help speed up your recovery from your weight training workouts, reduce muscle soreness, and burn some bodyfat at the same time.

FORBES: Lee Hayward