It will help the stroke if you can make you body lift and drop, it is called undulation.

如果你能使你的身体上来下去的话，将有助于你的划动。

youdao

Two legs to continue into the body lift on state body gravity fall, stand on his head on his shoulders, legs, two feet as far as possible unbend wearing tight slippers.

两腿继续上举成身体倒立状态，身体重心落在肩上，两腿尽可能伸直，两脚穿紧拖鞋。

youdao

As you become more proficient and comfortable in the pose, learn to lift and lighten the body by actively grounding the crown of the head onto the floor.

当你越来越熟练自如，试着头顶主动向地板伸展，借助地板的回弹力，帮助身体提升。

youdao

Many disabled people do not have the body strength to twist, pull, lift or balance objects the way able-bodied people do.

BBC: Disabled at risk at home

Above it, there's a muscular maelstrom of activity in which four men lift from the cross the body of Jesus, which is already turning green in death.

WSJ: Il Rosso Fiorentino | Deposition | A Maelstrom of Grief | Masterpiece by Peter Plagens

Members of the Protestant Orange Order's ruling body have voted overwhelmingly to defeat a motion calling on it to lift its ban on talking directly to the Northern Ireland Parades Commission.

BBC: Orange Order to continue talks ban