Muscle

6 min read THE BODY IS a complex machine. Your corporeal form houses over 600 muscles, all working together to help you perform your best every day. Fitness pros tend to organize all of these into different muscle groups—think upper body, lower body, core, and legs. If you're training to improve your physique, it may

Richard DruryGetty Images We’ve probably all experienced it: a sudden sharp pain in the calf or hamstring that makes us gasp for breath. Known as a charley horse, it happens when a muscle, commonly in the leg, suddenly contracts and tightens rock-hard. This often occurs after a long or intense workout, especially in hot weather,…