Find out how a strong lower back can transform workouts as you know them.
Never tried crossed-leg, behind-the-back leg lifts? Here's your chance.
Activate that yoga flow with quick bursts of cardio.
Sit-ups for leg strength? Try this video to see what we mean.
Put your legs in the air like you just don't care.
What Kathrine Switzer says, we do.
I strongly believe in running for reasons that don’t involve trying to control or punish my body.
It's not all about impressive arm balances and gravity-defying moves.
It's basically an entire gym—and a trainer—in a box.
Because your runs can't always be the opening scene from "Chariots of Fire."
Get after it, then gobble, gobble.