Quote Originally Posted by Phrost
I do sprints up the hill in my backyard... probably 40 meters. If you do the heel-toe thing, you get more of a workout. And since you're not worried about speed as much as working out, it's great.
What's the angle of your hill in the backyard? Perhaps a picture? At our house in Riverside, there is a 100 ft hill at about a 50-60* angle and it's impossible to run up it with heel-toe. But it's still fun as hell to do it on the balls of your feet.