That was so funny I watched it twice in a row. Why would he upload the video of himself or his friend falling on his ass that many times?
Edit:
A former high school friend of mine is a high level but not quite elite NHL defenceman (1st North American draft pick his year, leads his team in ice time, plays for Team Canada every year), and I’ve worked out a few times while he at the gym. For the most part, he followed a fairly standard workout routine with a few gimmicky exercises thrown in. The only bosu ball type stuff he did was to invert a bosu ball on the floor, stand on it with one leg and to do one-armed stretch band pulls (similar to a seated row).