Spinning round holding a metal ball on a wire and then just letting go, what could go wrong.
Fun fact: The "hammer" is a metal ball on a wire and hasn't resembled an actual hammer since the 1800s.
Someone figured out that going over backwards is actually faster, and now everyone does it.
Fun fact: Dick Fosbury was mocked for jumping backwards until he won gold at the 1968 Olympics and changed the sport forever.