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<font color="red">"For cardiovascular benefits i would recommend intervals reaching a minimum of 90% of your max HR for best results."</font>

What about using this as an other option for building Quads? It looks effective since sprinters have hugh legs. It utilizes fast twitch 2B`s. I take it that this would also burns a lot of glycogen that would have to be replaced soon after.


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Yep, right on! Sprinting is very anaerobic. It actually hits the hams and calves harder than glutes and quads, but definitely awesome for legs. Try substituting sprinting for leg day as a shock! Walk-back sprints work great - sprint all out for 15 seconds, then walk back to your starting line (about 45 seconds) and do that 5 times. Work up one more each time.

Since that type of exercise is at such a high intensity, you're right, it burns mostly glycogen for fuel. So, after you're done, you'd probably want to eat some high GI carbs or a Post workout shake similar to after a weight training workout [img]/forum/images/graemlins/cool.gif[/img]