Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. You probably work your ...
The best arm workouts target several major muscles at once. Tricep dips, push-ups, planks, and burpees will tone your arms and don't require weights. Exercise your upper body two to three times a week ...
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