Jack Knife

Add this exercise to your ab routine to spice up your core work:

 Lie faceup on the floor with your legs extended, your arms straight overhead and your feet and hands a few inches of the floor. 
 Squeeze your abs to lift both your upper and lower body off the floor in a smooth motion so your hands and feet meet directly over your navel.  Return to the start under control. 
Repeat.

Try this quick exercise out ASAP

After the age of 30, your metabolic rate slows down and you lose bone density. This exercise can help reverse the effects of aging: Lay your forearm down on a countertop or other flat surface, and bring one leg up behind you, squeezing in your abdominals. Do 30 leg lifts to the side, and then 30 to the back.

How much?