Engage core and press through heels and upper back to lift hips a couple of inches off floor. Bend knees and use hamstrings ...

Willis recommends runnning these exercises "circuit-style," doing 40 seconds on, 20 seconds off. "Three rounds if you're ...

Reverse crunch to leg lifts target the lower abs, an area that often gets neglected. It combines two effective core exercises into one seamless flow. Reverse crunches lift and tighten the lower belly ...

B) Bend your knees, contract your abs and slam the ball down to the ground. Try not to round your back when you pick up the ball. 'High-to-low slams are perfect for combining core strength with cardio ...