Check out Women's Health's FitGIF Friday every week for fun and challenging new moves to make your sweat sesh really count. This week's exercise is courtesy of Furthermore:

T Pushup: Ever notice how swimmers have the most amazing bodies? That's because swimming works nearly every muscle in your body. To take your swimming sessions to the next level, supplement them with on-land strength training that can increase speed and endurance. Specifically, the "T pushup" is great for improving your freestyle stroke. For more moves you can perform poolside, check out this page on Furthermore. 

(Get more legs-sculpting workouts from Women's Health's Look Better Naked DVD.)

t pushup
Furthermore

How to: Begin in a high plank with feet hip-distance apart. Perform a pushup, with your elbows tucked into the sides of your body. At the top of your pushup, let both feet fall to the right and stack them as you open to a side plank, with your left arm reaching towards the sky. Your body should resemble a "T" shape. Return to your starting high plank position. Then repeat on the other side. Continue alternating. Repeat four to six times on each side.