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Stand with your feet shoulder-width apart, and hold a kettlebell in each hand by the handle at your sides. Your arms should be straight. From here, raise the weight upward until your arms are directly out to either side and parallel to the floor — i.e., the “up” position of a lateral raise. Now flex your deltoid cap tight and hold the dumbbells in that pose for as long as you can hold it before your form breaks. (Note that you also can use dumbbells for this isometric-hold exercise if it’s more convenient.)