Better Workout

Slider Body Saw

Place sliders underneath each foot. Then get into a plank position with your forearms planted on the floor at shoulder-width, your body raised, and in a straight line. Now, brace your core, and, with your forearms still planted in the floor, begin sliding your whole body forward and back.

Bicycle Crunch

Lie on your back, extending one leg, while bringing the opposite knee toward your chest. With your hands behind your head, touch your opposite elbow to the close knee. Twist your body and touch the other elbow to your other knee.

Box Squat

Set up a box or a bench behind you that is close enough to sit. Do squats with the buttocks slightly touching the box as you lower down. You can use a barbell or other weights when doing the exercise for added challenge and weight.