According to French philosopher René Descartes the universe operated as a continuously running machine which God had set in motion. Since he rejected Newton's theory of gravity and idea of a vacuum in space, Descartes argued that instead the u
This 20 minute treadmill workout varies the incline and speed to challenge your body and help you build endurance.
Learn how you can get more out of your treadmill workouts with this complete guide to running on this amazing machine! - Tap the pin if you love super heroes too! Cause guess what? you will LOVE these super hero fitness shirts!
Merax JK1603E Easy Assembly Folding Electric Treadmill Motorized Running Machine