2. Calf Smash With Lacrosse Ball 

Calf SmashSit on the ground and pull your right foot close to your butt so your knee is bent. Wedge a lacrosse ball (or yoga/massage ball) below your right knee, sandwiching it between your calf and hamstring. Create a “compression force” by pulling your shin toward you, then rotate your foot in alternating circular movements to help create space in your knee joint. Continue until you feel tightness in these areas being relieved, then switch legs.

3. Half-Kneel Hip and Quad Stretch 

This stretch not only feels amazing, but it also works double-duty for your hip and quad muscles, Williams explains.

Half Kneel Hip and Quad Stretch

Kneel on one knee (feel free to put down a towel or mat) with your other foot planted flat on the ground in front of you. Make close to a 90-degree angle with both of your legs. Lean forward toward your front leg, stretching the front of your hip downward. Next, grab the ankle of your leg planted on the ground, and pull it toward your rear for a deep hamstring and hip stretch down the front leg, all the way to your knee. Move in and out of this stretch for 10 to 15 reps or more, depending on your level of tightness.

4. Quad Foam Roller Stretch 

Quad Foam Roller Stretch

Stretching your quads is vital, as they get adaptively short from all the sitting most of us do every day and are often under constant tension. To get this large muscle group back to functioning at its best, Williams suggests using a foam roller.

Lie facedown and with a foam roller under your right leg, right under your quad. Put the majority of your bodyweight on your leg, and roll slowly. Instead of simply rolling up and down, roll your leg from side to side too, focusing pressure on the tighter spots of your muscles. Switch legs. Continue rolling until this feeling is no longer painful. If that’s impossible (as it might be for some runners!), do it for at least five minutes.

5. Wall Hamstring Stretch 

Wall Hamstring Stretch

Our hamstring muscles affect the knee more than we think and can be the source of discomfort or pain.

Lie faceup with your left leg flat on the ground, foot flexed. Take your right leg and prop it up on a wall or table, or use a resistance band. This stretch should radiate down the back of your leg, beginning in your knee. Once you find the deepest point of the stretch, alternate in five-second sequences between contracting and relaxing the foot of your right leg. If you have greater flexibility, hold the ankle of your right leg and pull it toward you. Aim for 10 to 15 rounds of five-second holds, and continue if you still feel tight. Repeat with your left leg.

6. Straight-Leg Raise 

Straight Leg Raise

Easy strengthening exercises, like leg raises, put little to no strain on your knee but also activate and strengthen quadriceps.

Lie faceup with one knee bent and the other leg the ground in front of you. Lift your straight leg up approximately one foot, rotating your leg outward (the entire leg rotates outward, so toes point on a diagonal instead of straight up to the ceiling). Do 3 sets of 10 to 15 reps, alternating legs. As you get stronger, add ankle weights up to 10 pounds.

Article sourced at: http://greatist.com/move/knee-pain-relief