The seated mountain climber is an excellent intermediate level exercise that activates your core. It will teach you how to tilt your pelvis back and scoop your belly in deep to tone your abs.Use a yoga block or a book:1.) Place the object on the wall and hold it there with your toes.2.) Extend your legs engage your quads and scoop your belly in deep.3.) You can place your hand under your upper thigh (close to your bottom), across your chest or behind your head (as in the video)4.) Slow [...]