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 ...

Your leg muscles are often applauded for doing most of the work on a run. But you’re not just running around with your arms tucked by your sides—at least you shouldn’t be. Instead, your arms swing ...

Dynamic stretching isn’t just a warm-up—it’s a performance booster. By actively moving muscles and joints, you prime your body for speed, power, and endurance. Science shows it can improve flexibility ...

Lie faceup in a reverse tabletop position with your hips and knees bent 90 degrees. Place a yoga block or Pilates ball ...

To achieve a sculpted look with the upper body, you need a well-rounded routine made up of exercises that target every part of the arm, including the shoulders, triceps and biceps. Strong arms don’t ...

Editor’s note: Before beginning any new exercise program, consult your doctor. Stop immediately if you experience pain. As you head into the gym, you likely already have a workout plan in mind. Maybe ...

When you think of training your upper body, your mind likely jumps to muscles like the biceps, triceps, shoulders, and chest. Yes, these are all so important for a strong bod. But your routine may be ...