They can get it either with moderate or vigorous exercise -- you can enjoy a brisk walk, jog, dance, bike, or swim.
他们可以从中度的或者剧烈的锻炼中得到这样的效果--你可以快步走，慢跑，跳舞，单车，或者游泳。
If you hate the idea of anyone seeing you exercise, then don't force yourself to go to a gym or jog outside.
如果你不喜欢在大庭广众之下锻炼，也不必强迫自己去健身房或到户外跑步。
An exercise device consisting of an endless moving belt on which a person can walk or jog while remaining in one place.
踏车一种由一根不断运动的皮带组成的锻炼装置，人可以在上面行走，但仍停留在原地。
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