英语语法分析

We challenge each other to do pistols (one-legged squats) or handstand pushups. Mostly we can't, but it's fun.

我们互相挑战做手枪（单腿下蹲）或是倒立。大多数时候我们不能，但这很有趣。

I do pushups with them on my back.

做俯卧撑时，我让孩子骑在背上。

Do some pushups if you want to get fitter.

如果你想身体强健，试试俯卧撑。