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. The major muscle in ...

Have you ever finished a workout and noticed your muscles looking fuller, tighter and more defined? It is what the fitness enthusiasts call a muscle pump. This temporary swelling happens when blood ...

From rows to squats and flys to presses, I’ve rounded up my favorite dumbbell exercises for every muscle group. Simple, beginner-friendly, and supremely effective, a set of dumbbells is an ideal way ...