HOW TO DO IT: Step to your left and lower your body into a lateral lunge, placing both hands on the floor. Without moving your feet, lift your hands and hips and shift your weight over your right foot, so you end up in a right-side lunge. Alternate back and forth for 30 to 60 seconds. To really kick up the burn, turn this movement into a monkey shuffle by simultaneously loading your hands, lifting your hips and shuffling your feet side-to-side between right and left lunge positions.
Stand in a side lunge position with one leg bent parallel to the floor and the other leg straight to the side. Jump up explosively as you switch legs. Now the previously straight leg will be bent and the previously bent leg will be straight to the other side. Try and keep your core tight and stay as low as possible as you switch sides as fast as you can.
You probably have a vague sense that exercise is good for you—and you’ve probably heard that it’s “healthy for the heart.” But if you’re like most people, that’s not enough motivation to get you to break a sweat with any regularity. As I report in the TIME cover story, “The Exercise Cure,” only 20% of Americans get the recommended 150 minutes of strength and cardiovascular physical activity per week, more than half of all baby boomers report doing no exercise whatsoever, and 80.2 million Americans over age 6 are entirely inactive.
Don’t be afraid of weights. After all, muscle burns more calories than fat. Do you want to know how to lose arm fat? Start with dumbbells, says Dede Lagree, who has worked with Angel Elsa Hosk and is the owner and head trainer at Lagree Fitness Studio. For Lagree’s arm-toning workout, choose a pair of dumbbells that you can safely lift at least 20 times. But pick a weight that challenges you: Your arms should feel that 20th rep! Don’t have dumbbells? Substitute soup cans or water bottles, Lagree says. Check out all the great body changes you get from lifting.

Exhale and use your triceps to lift the weight until your right arm is fully extended behind you. Supinate by turning your palm up as your arm moves back, so that your palm faces the ceiling. Move only your forearm and do not use your left hand or your legs. Pause once your right arm is fully extended, inhale, and then exhale as you bring the free weight back to the starting position.

This workout incorporates three blocks that you will rotate through four times. The first round is the longest (I told you I always like to get the hardest part of the workout done first!) and the duration of each subsequent round decreases a bit. Hopefully this serves as motivation to stick with it, knowing you’ll knock out the hardest part of the workout first!


If you're ready to move on from classic Bulgarian split squats, Swan's amped-up variation gets your upper body in on the action for a true total-body exercise. "This combination move works your legs, butt, chest, back, arms, and core," she says. "And it not only hits all the major muscle groups—it also lets you work on balance." Give it a shot and you'll see why. 
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