They call rowing the perfect sport. It exercises every major muscle group.

他们把划船称之为完美的运动。它锻炼身体的各主要肌肉群。

《柯林斯英汉双解大词典》

They can involve part or a whole muscle group.

这可能影响到部分或整个肌群。

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I went Monday through Friday for about 45 minutes, hitting every major muscle group.

——周一到周五，我每天大约在健身房锻炼45分钟，所有的主要肌群都练到了。

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Stretching the muscle group during the cramp attack can be helpful in relieving it.

CNN: What causes leg cramps?

Using almost every muscle group in the body, the sport has long been hailed for its all-round fitness benefits.

BBC: Cross-country skiing in Washington��s Methow Valley

Sense each muscle group for 15 seconds.

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