the only time it happened to me (almost unable to get onboard) i was fighting to right it in fast waves (just outside the sand key pass, which gets crazy) and very strong current.

As soon as it was righted the jib filled with air and took off. i had to pull myself up about 20' of mainsheet.. get up front (while its goin 10-15) and get up her.... I was so exhausted... i almost couldn't. I THINK i did end up FEET FIRST.

As soon as i was on board i found out that my main was wrapped around my rudders/travler there was no turing nor uncleating untill it was un-tied.

There was no amount of "going to the gym" that can prepare you for that... i am actually in good shape (from sailing 3 days a week for years).... but i did learn many things that day...