After all, hypertrophy (the technical term for muscle growth) is largely a numbers game, and getting the equation right can equal maximum gains in minimal time. You want to work hard, but your goal ...

Challenge yourself & build upper body strength with these 10 push-up variations. From beginner to advanced, the perfect push-ups to level up.

Most Runners Ignore This Hidden Muscle Group. It’s Quietly Sabotaging Your Stride.

Try to target 8–10 muscle groups, and start out at about 30–40% of your maximum effort before progressing over time to 70–80% of your maximum.

Engage in an equivalent mix of moderate- and vigorous-intensity aerobic activity on 2 or more days a week AND work all major muscle groups 2 days a week.

Include strength training exercises at least two to three times a week, focusing on all major muscle groups. Start with less resistance and gradually increase as you build strength.

Finally, strong deep core muscles can help improve your posture. They’ll prevent your pelvis from tilting too far backward, ...

Stephen Ranellone — an exercise physiologist at the Hospital for Special Surgery in Manhattan — weighs in on the pros and cons of split workouts and full-body burns.