CrossFit is also based on using your own body weight to work out, but it adds barbells, medicine balls and kettlebells to the mix. The workout program combines elements of weightlifting, calisthenics, gymnastics, and track and field. This form of exercise originated in the military, meaning that CrossFit trainers also take a drill-instructor-like approach to how they teach their courses. A heart rate monitor watch lets you keep an eye on your pulse and helps make your workout particularly effective. VARTA has the right button cells
for your watch or chest strap.