Seated Knee Up

Start

When you've fried your abs and feel the need for a couple more sets, finish up with this six-pack-building crunch.

Execution

After leaning your torso forward while bringing knees toward the chest, exhale toward the top of the movement. Crunch your abs at the top, then slowly return to the start position


Crunch

Use this basic move to tighten your midsection



Start

Lie on the floor with your knees bent and hands behind your head.

Execution

Curl up, bringing you torso toward your knees, concentrating on crunching your abs muscles as you come up. Try to get your shoulder blades off the floor. Don't pull on your head or press your chin into your chest.

By muscleandfitness.com