Which fungi do pushups?
Earthstars! Unlike their passive relatives the puffballs, earthstars have three outer layers. When it rains, the outer two layers uncurl and form a star with 4–12 points, while the inner layer remains intact, enclosing the dry spore mass. The points spread out and push aside debris that may inhibit the "puffing" mechanism, and push the spore-filled sac up off the ground. When the ground dries, the points re-curl and the sac lowers.