Try this, do as many below parallel squats as you can do in 10 minutes.....shoot for 350-400 as a good number
Let the quads start burning and the heart rate start climbing.
The picture below serves two purposes, one to show you below parallel means (a little too deep but you get the idea, don't half ass it) and two, yet another answer to the question I hear from women, "will lifting weights make me big and bulky?"
