The fitness world mourns the loss of health & fitness guru Joe Weider who died March 23, 2013 at the age of 93. Weider, originally entering the fitness arena as a way to defend himself against bullies, created a multi-million dollar empire through health & fitness ventures.

Noticing a popping feeling and sound in your hips? Here's why it happens, where it comes from and how you can fix it.

Dr. Phil Wagner of SPARTA identifies the most common injury in athletes, one you've probably never heard of. Find out what it is, how it affects the body, how to treat it and how to prevent it.

March Madness is taking over, as it does every year. Why is it such an obsession? We've outlined our top 5 reasons here.

No matter their shape or size, all new mothers face the same post-pregnancy-problem: baby weight. Check out how four big time Hollywood stars solved it.

ATLX profiles the incredible story of John Siciliano.

Training for a Mud Run? Whether it's your first dash in the dirt or you're a seasoned vet, preparation is a must. ATLX Expert Brett Stewart wrote the book - literally - on training for Obstacle Races. The first step? RUN!

Still not convinced you've got what it takes to brave the muddy terrain of an adventure race? ATLX Expert Brett Stewart, obstacle racer extraordinaire, says YES YOU CAN!

Who says you shouldn't play in the mud? This new kids-only Mud Run and Obstacle Course encourages families to get active together for a good cause.

Changing bodies, changing lives. That's what Timmy T does best.