It is important never to overdo new exercises
重要的是，不要过度练习新学的动作。
You should work hard, but don't overdo it and make yourself ill.
你应努力工作，但不可过度把自己累病了。
The meat was ─ how shall I put it? ─ a little overdone.
这肉嘛，怎么说呢，做得稍微老了点儿。
Use illustrations where appropriate but don't overdo it.
要适当地使用插图，但不宜过多。
I overdid it in the gym and hurt my back.
我在健身房练得过火了，结果弄伤了背。