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Stand with your feet shoulder-width apart or slightly wider, and hold a dumbbell in each hand at shoulder level with a supinated (palms facing you) grip. With your eyes focused forward, core tight and elbows aligned under your wrists, press the dumbbells overhead in an arc while simultaneously twisting both wrists so that by the time you reach full elbow extension, your palms are now facing away from you in a pronated grip. (Note that your elbows will naturally shift outward as you twist on the way up and then come back in tighter to your torso on the way down.) Reverse the motion to return to the start and repeat.