You put a lot of stress on your hip flexors when you sprint or kick. Thatâs why athletes, especially runners, soccer players, and martial artists, are especially prone to hip flexor injuries that result in hip flexor pain. Hip flexor pain is usually felt in the upper groin region, where the thigh meets the pelvis. To avoid hip flexor pain, you should pay more attention to these muscles, Dr. Siegrist explains. When you are seated, your knees are bent and your hip muscles are flexed and often tighten up or become shortened.
Walking and bicycling are good exercises for bad knees because they aren't high-impact. If you belong to a gym, the elliptical machine is another good option; the machine has pedals instead of a flat, treadmill-like surface and allows you to simulate running and walking without the impact on the joints.
Here is a list of kneeboarding tricks: 1  Riding - Ride with your arms at full extension (this keeps your arms from tiring,) your knees in the divits, and the strap on relatively tight.  Turning - While riding, hold on tightly to the tow rope, and lean your body to one side. This should put the kneeboard on its edge, and take you outside of the boat's wake. To come back straight behind the boat, lean in the other direction. To turn more aggressively, pull in on the rope with your arms and lean harder.