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Extreme Fitness: How Many Calories Did You Burn?

Rock Climbing

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Calories burned per hour: about 550

This total body workout targets the arms and shoulders. The gear's not cheap (climbing shoes, rope, carabiners, a harness, webbing, protective devices, and a helmet), so find a school that allows you to rent equipment. See what outdoor exercises celebs are doing.

Snowboarding

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Calories burned per hour: about 500

Whether you're a pro boarder or can barely make it off the ski lift, this rigorous sport will leave you toned from head to toe (and probably a bit sore the next day). Snowboarding challenges your legs the most, but staying balanced on the board is a great core workout, too.

Whitewater Rafting

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Calories burned per hour: 300 to 350

Rafting is a great upper-body workout—and way more fun than doing dumbbell curls at the gym. Not only does rafting tone your arms, back and shoulders, it’s also a great ab workout since you rely on your core to keep you steady.

Paddle Boarding

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Calories burned per hour: 500 to 700

Ride this celebrity trend (Jennifer Aniston and Kate Hudson are fans!) by hopping on a board, grabbing a paddle, and finding some mellow surf. The hardest part is standing up, but after that, you'll glide your way through the water. Check out our favorite board.

Mountain Biking

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Calories burned per hour: 500 to 600

Looking for an adrenaline rush? Nothing beats pushing up trails at a hard pace and then whizzing downhill. Plus, biking is great for firming up your biceps, butt, and thighs. For success: Wear a helmet, and stick to trails that fit your experience level.

Scuba Diving

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Calories burned per hour: about 900

Show off that bikini body by working out in…a bikini! Scuba diving has one of the biggest payoffs of any extreme fitness workout and is a terrific butt, hip, thigh, and ab workout. Many dive shops offer certification courses that teach you to deal with water pressure and maneuver with equipment.

Surfing

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Calories burned per hour: about 200

Anyone can jump up on a surfboard—staying up is the real challenge. Surfing is not just a great workout that'll tone your core, legs and arms, but it's also a powerful exhilarating experience. Be the envy of everyone on the beach this year with Bob Harper's Workout Plan.

Cross-Country Skiing

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Calories burned per hour: about 500 (or more)

This winter sport might not involve steep hills, but cross-country skiing is a tough cardio workout that's not for the faint of heart. Gravity isn't helping you here, like it is in downhill skiing; you're legs and arms do all the work to get you around.