Jackknife Crunch

A great way to work out all of your ab muscles is an alternate, bent-knee Jackknife crunch with a twist.

To start, lie down on your back with your hands behind your head. Crunch up and bring your right elbow to the left knee, and vice-versa. Then, bring in both knees. Keep alternating – left, right, center – for 10 to 20 reps.

For greater force, exhale before each crunch.

Jon Jon Park, CEO and Founder, Legacy Gym

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Swimsuit Ready Challenge

This exercise is part of our Swimsuit Ready Challenge (April 2-30, 2012). Do this exercise and comment below “I did this!” to be entered to win our $100 and $50 giveaways. You may enter up to one time per day through April 30th.

Also – be sure to share this on Facebook, Pinterest and other sites to let your friends cheer you on or – better yet – join in on the challenge so they can hang out on the beach with you this summer!