Well...youtube isn't working for me today, and I don't have quicktime so I can't check to see if this is old or not today. I often forget about things like this because I'm usually busy (hence why I rarely come on here). So try forgiving me if this was found on the first day of SA2 or something like that.
Anyways, just after the first part of Pyramid Cave in SA2(B), if you charge a spindash while holding up on the control stick and roll into the timer, you can land on the roof and continue right into the first set of uneven bars. It saves a nice bit of time.