Use a folded blanket or sticky mat to pad your head and forearms.

用一块折叠的垫子或者粘垫护着你的头和前臂。

youdao

Though I would make a suggestion. You should get a sticky mat for the bottom of your tub.

我倒有个建议，可以在浴缸底下放个防滑垫。

youdao

You can place a sticky mat over the blankets to help the upper arms stay in place while in the pose.

你可以在垫子上放个硬点的席子，以帮助在这个体式时上臂的放置的位子。

youdao