The hanging knee raise hits your lower abs. You can hang from literally anything to do this exercise, but the most popular method using hanging from a pull up bar.

Grip the bar with hands around shoulder width apart. Increase the width if you're tall and your feet touch the floor.

Once you're hanging with your feet slightly off the floor, slowly pull your knees up keeping your legs together.

Pause for a second, and slowly lower your knees back to the starting position.

Repeat for desired reps.

Knee Raise Tips:

You must do this exercise slowly.If you want to get the most benefit out of the hanging knee raise, slow it down.

As you become more advanced, you can place a dumbbell between your feet.

Avoid swinging your body, keeping your torso as still as possible.