|
I've only heard this second hand, haven't experienced it myself, but over time the thrusting action of the legs causes the back (if not compensated via abdominal pressure) to "jar" (i.e., belly button moves toward the ground too much. I'm not an exercise phys person, so I'm not sure what to call this motion). The way I see it high rep anything over the long term will probably result in some sort of injury, so why not spruce things up?
__________________
Ut Prosim
|