Or better, I think of swimming in the ocean. Some people just throw themselves in without worrying. But when the surf is churning, some stand at the edge and calculate when to enter. You don’t want to get stuck at the shoreline when a big wave comes plowing in. You need energy and good timing to make it out past the crashy part, with its shells and stones, to the undulating area. Once in, it’s fun, the peril abates, until it's time to get back out.
There's a word for the fear of waves and wave-like motion: kymophobia.
Thx to Shannon Rankin for the collage image