While the showoff muscles get all the acclaim, they'd be nothing without the supporting cast of smaller stabilizers and assisting muscles. Ignore them, experts say—and you'll eventually pay the price. The cost? Injury. Missed workouts. Painful runs. An unbalanced body. Wondering if your'e guilty? Here, experts discuss the most neglected muscles, why they're important, and how to strengthen them for an even, injury-free physique.
If you train only the muscles you can flex in the mirror, you may be sacrificing your progress—and inviting injury.