The Worst Ive ever done is a Hyperextention. Two Nights of Ice fixed that nicely.If you've never been so "lucky" as to experience it, knee problems SUCK. I'm pretty sure I've taken my weight in fish oil capsules over the last year or so
And then I did it again a Month Later, before Realizing I was too Relaxed during the End Part of the Kick, and needed to Tense up more (The Irony is Fantastic, given how everyone else here is talking about Relaxing )
It wasnt too fun, but I can imagine that a more Intense and Constant and Similar thing wouldnt be Fun