Extended Side-Angle Pose is a study of strength and softness. And the most important muscle for proper alignment? The psoas.

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

You can strengthen your back with exercises, including bent-over rows, pullups, back extensions, and more. These different exercises target and strengthen different muscles in the back. If you’ve ever ...