This cross section through the flight muscles of a dancer damselfly shows in blue the muscle fibers that the fly uses to flap its wings. You can also see the nerve that stimulates these muscles in red ...

A broad, well-defined back is a cornerstone of any well-rounded physique. But that’s not the only reason to pump up your posterior—it’s also a critical way of improving posture, reducing back pain, ...

Think about your back. It's a complex and powerful structure, vital for almost any movement you make, from lifting a grocery bag to sitting upright at your computer. Training it properly isn't just ...

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 ...

These dark blue tubes splattered with red and green are fruit fly muscles. This image shows where the nerves and the muscles meet in the larva of a fly. These dark blue tubes splattered with red and ...