You could also do single arm drill with your arm down by your side. This is the way we like to do.

你还可以进行单臂划水训练，一只手臂置于体侧。

youdao

You could also do single arm drill with your arm down by your side. This is the way we like to do.

你还可以进行单臂划水训练，一只手臂置于体侧。

youdao