After tough workout or a day full of physical activity, it's common to find your muscles aching, but where do these pains come from?
2019年12月四級真題（第一套）聽力 Section C
What your memory needs is a good workout.
出自-2016年6月聽力原文
If you're tired of wandering around the gym wasting time and becoming bored, you can attend an upbeat group fitness class that'll keep your workout on track.