any good interval training programs

Leanbean65

I'm looking for a good interval training for the treadmill in the 20-30 min range. I can't run because of a bad ankle but I can walk pretty fast and my treadmill will go up to about a 12 % incline.

Sugarbeat

You could try this one http://www.nerdfitness.com/blog/2009/01/27/kick-your-*kitten*-and-kickstart-your-metabolism-in-20-minutes/. I've just started. Or look up fitness magazine's workouts, they have several you might be interested in. Sorry I don't have links for those. Good luck!