The Quadriceps are a group of muscles located at your thigh that are extremely important for running as they extend your leg. As assumed from the name, your quads are made up of four different muscles. Unlike the calf stretch, each stretch will stretch more than one of the four muscles, but doing more than one of the stretches will yield better results.
The most common and simple quad stretch is the standing quad stretch. Support yourself against a wall with your arm, and with your other hand, hold up your leg (same side as the arm that is holding it) around the ankle, and pull until you feel a stretch on the front of your thigh. Usually, forty-five seconds to a minute is enough per leg for this stretch.
After stretching against a wall, find a mat or a soft place to lie down. While on your side, leave the leg on the ground extended and pull back on your other leg with the same side arm. With your other arm, prop your head up. If you do not feel much, push your hip forward and this will increase the stretching. Give each leg around thirty seconds before switching.
Lastly, push your matt up against a wall so that it is flush with the wall (or get a small towel or pad and place it next to the wall). Kneel on one knee and lift up the foot whose knee is on the ground. Reverse until the lifted leg is against the wall (your other leg should be at a 90ยบ angle. Keep your hands on your hips and face forward. Hold this stretch for at least 30 seconds and then switch.