From Shape Magazine: Week 2: Repeat minutes 10-14 five more times.
Week 3: Increase your speed 0.2mph each time you increase the incline, then return to your normal speed for your flat runs.
Week 4: Increase your speed 0.4mph each time you increase the incline, then return to your normal speed for your flat runs.
Week 5: Increase your speed 0.6mph each time you increase the incline, then return to your normal speed for your flat runs.
A commercial level treadmill that folds up for easy storage. Automatic incline and decline, plus a large screen make this a great treadmill for your home gym.