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1·You should also avoid going above a 7% incline, because it places too much strain on your back, hips and ankles.

你还应该避免超过7%坡度，因为这会让你的背部、臀部和脚踝承受太大的压力。

2·Can you float on your back?

你能仰浮吗？《牛津词典》

3·Do you sleep on your back or your front?

你睡觉是仰着还是趴着？《牛津词典》

4·Come on. Carry my bag on your back.

来，背上我的包。

5·Lie on your back and draw in long breaths of it.

躺下，深呼吸吧。

6·Roll over and try the same exercise on your back.

翻身，背部做同样的运动。

7·After all, a little healthy worrying is okay if it leads to constructive action—like having a doctor look at that weird spot on your back.

毕竟，一点点健康的担忧是可以的，如果它能带来建设性的行动——比如让医生检查你背上那个奇怪的斑点。

8·Please lie down on your back.

请仰躺下来。

9·Lie on your back, arms by your sides.

背部着地仰卧，双臂置于身体两侧。

10·Lie down on your back and shoot up.

甚至可以躺下来拍。