Treadmill - 10% incline @ 10 mph

If you can run at 10 mph on a regular basis, you may be looking for ways to improve your time. Try adding ÒhillsÓ to your workout on a treadmill. After a brief warm-up period, begin elevating the treadmill until you've reached a 10% grade. Try to maintain this elevation for 5-minute intervals, punctuated with periods of rest.