[yosahab]

I used it to a certain extent when getting ready for a show and it worked really well but I did burn up some muscle. I did it on the treadmill mainly and it went:
2:00 min walk at 3.5 mph
1:30 min jog at 6.5 mph
1:30 min sprint at 8.0 mph

I usually did this for 30-40 minutes.