Chicks dig fit guys. But what do they love most about them? Women prefer men whose shoulders are 1.6 times the size of their waists, according to an Archives of Sexual Behavior study. Start sculpting a great set of shoulders and a slimmer waist with this weekend's fitness challenge created by Todd Durkin, C.S.C.S. You'll begin with a three exercises that target your front, middle, and rear deltoids. This is the roundish-looking muscle that caps the top of your upper arm and the one you show off in a sleeveless shirt. Then you'll blast your gut by jumping rope. Perform this challenge every weekend until the start of summer, and you'll chisel the ultimate, lady-killing V-shape.

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Here's how to do it: Perform the exercises in the order shown. Repeat.

Dumbbell Lateral Raise
Grab a pair of 15-pound dumbbells and let them hang at arm's length next to your sides, with your palms facing each other. Without changing the bend in your elbows, raise your arms straight out to your sides until they're at shoulder level. Then lower the weights back to the starting point. That's 1 repetition. Do 10.

Dumbbell Front Raise
Let the weights hang at arm's length next to your sides. Raise your arms straight in front of your until they're parallel to the floor and perpendicular to your torso. Then lower the weights back to the starting point. Perform 10 reps.

Dumbbell Rear Lateral Raise
Bend forward at your hips until your torso is nearly parallel to the floor. Let the dumbbells hang straight down from your shoulders, your palms having each other. Without moving your torso, raise your arms straight out to your sides until they're in line with your body. Then return the weights back to the starting point. That's 1 rep. Do 10.

Jump Rope
With each jump, your weight should be on the balls of your feet and your knees slightly bent. Don't jump more than an inch. Keep your body upright, eyes front, and elbows close, and make small circles with your wrists. The goal is to maintain a fast rhythm. Complete 30 jumps.

Ready to try it? Watch the video above to see Durkin perform the challenge. He completed the circuit twice in two minutes and 48 seconds. What was your time? Tell us in the comments below.

And if you're ready for total-body transformation, you have to check out SPEED SHRED, the first-ever DVD fitness program from Men's Health. With 18 workouts -- and hundreds of cutting-edge exercises -- this plan will change the way you train forever. All to get you lean, ripped, and shredded!