I've seen statements to the effect that 10 minutes of high energy rebounding gives the same benefit as 30 minutes of jogging.

I know that in the beginning, doing 5 minutes of low impact jumping jacks on the rebounder made me really SWEAT! LoL. These days I can do 300 jumping jacks on the rebounder without raising a sweat. But boy howdy! I sure do feel it!

I think rebounding is wayyyy too much fun to be good for me. I use the urban rebounder, by the way and I think there's a world of difference in the bounce between it and say, a walmart $35 cheapie model.

JMHO!