This exercise will work the muscles of the lower back.
这样的运动可以锻炼腰部的肌肉。
《牛津词典》
2
Roll over and try the same exercise on your back.
翻身，背部做同样的运动。
3
Getting back into exercise can be a challenge in the best of times, but with gyms and in-person exercise classes off-limits to many people these days, it can be tricky to know where to start.