Make sure to keep your form correct. In lunges, make sure your knee does not go forward past your toes. While doing crunches, make sure your hands are not pulling up on your neck. Your job: do as many repititions with good form as you possibly can in the 20 seconds of exercise - push it hard! Then rest. The goal is to go all out and use the rest period to transition and relax.
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.
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