My writing (250-300 words)
In health, you also want to fail fast to learn right away. The more mistakes you make, the faster you will learn
There is a big caveat here- failure does not mean persisting in pain.
It’s fine to make a mistake, and feel a bit of pain when you do- but it is not good or smart to persist in pain. You’re just going to make things worse for you.
So in fitness, failing fast means making quick mistakes