A tear to the medial collateral ligament in the knee can cause pain, swelling, and a lack of stability in the knee. Treatment is usually with ice, a knee brace, and physical therapy. Surgery may be necessary in rare cases.
Consider working out with a medicine ball, an inexpensive fitness tool that's exploding in popularity. This weighted ball helps you develop strength, endurance and even flexibility -- and many exercises are done with a partner, adding a fun dimension to workouts.