At least 35% of all cancer deaths may be related to overweight and lack of activity, the Seattle Cancer Research Centre has found. Exercise is believed to speed the passage of food through the colon, thereby reducing the amount of time that any toxins are in contact with the body. Overweight people also tend to have more insulin, which promotes the growth of tumours. For women, exercise reduces the level of oestrogen, a hormone linked to breast cancer.
Stand with your feet hip-distance apart and your arms at your sides. Squat until your thighs are parallel to the floor. Keeping your arms straight, bring them forward and up until your upper arms are in line with your ears (A). Return to standing, then lift your right knee to hip height as you sweep your arms down across your body until the back of your left hand is outside your right knee (B). Return to standing and repeat on the other side. That's one rep. Do three sets of 12 to 15 reps, resting for 30 seconds between sets.
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.