Whether you have a mostly sedentary lifestyle or are an active athlete, the butterfly stretch — which opens up the hips, inner thighs, and groin — is fundamental for functional flexibility. "Open hips ...

While muscle groups like the chest, biceps, and glutes tend to get an abundance of attention, no strong physique is complete without a well-developed back. All too often, however, we overlook back ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Though nearly 10% of people around the world suffer from low back pain, it can be tricky to find relief.

Leoni Jesner is a fitness, health, and lifestyle writer who has contributed to Byrdie and LIVESTRONG.com, among other publications. She is also a personal trainer, mat Pilates instructor, and ...