Every joint in the body - knees, hips, ankles, shoulders - has what is considered a normal or healthy range of motion. When you go down into a squat, do your legs bow out and your heels lift? That's a common example of our body being restricted from what is considered a healthy range of motion.
Whether it's riding a bike, running a marathon, or simply expressing movement in your day to day life, healthy ranges of motion are critical for comfort, efficiency, and injury prevention. The irony is that many healthy physical activities - like running or weight lifting - actually reduce ranges of motion due to repeated tension and contraction of muscles. Such repetition over the years can result in very restricted bodies!
Yoga, on the other hand, is quite different from other forms of physical activity. Yoga teaches your muscles and your nervous system proper positioning and length. During yoga, you stretch and move the entire body throughout various poses and into end ranges. By doing so, you help the muscles, ligaments, connective tissues and tendons find and maintain normal, healthy range of motion.
If you want your body to reach its full potential during physical activity, then you need to find and maintain healthy range of motion within all your major joints. Yoga does so - it helps us be our very best, which is why we love it!