US schools are starting to ban physical exercise such as cartwheels. I suspect fear of being sued is a contributing factor somehow.

It might make sense to forbid practices such as American football, which cause grave permanent injuries to a large fraction of participants.

I have always been timid about physical exercise that struck me as dangerous. I have never dared to do a cartwheel. But I think I'd have had a better life if I had not been so timid.