The muscles have tightened up to cause that soreness in those muscles. Freeing the muscles back up will allow the pain to be released and here's how to free up your thigh and calf muscles for your relief:
Sit on a chair with your leg partially extended to where it feels comfortable. Wrap both hands around the muscle about 2 inches behind your knee. Press in with both hands and hold a firm pressure on the muscle. Now relax, take a deep breath and exhale, then remain this relaxed. After 20 seconds or so you should feel the muscle releasing. As it’s a big one it’s going to continue to do so for about a minute or so. When you no longer notice any releasing happening, slowly slide your foot back up to the chair, then release the pressure on the muscle but continue resting your foot by the chair for another 30 seconds.
While sitting pull your leg into your lap. Take the hand on the same side of your body as the leg and wrap your fingers around the front of your leg, about midway, so you can press your thumb into the muscle in the back of your leg. Then take your hand from the opposite side and place it right under your first hand so you can press your thumb into the muscle as well. Then press both in with a good amount of pressure and hold. Now relax your body by taking a deep breath and exhaling then remain this relaxed. After 45 seconds slowly raise the front of your foot upward as far as you can, then release the pressure on the muscle, but continue holding the front of your foot upward for another 30 seconds.
For best results relax your body first by taking a deep breath and exhaling then remain this relaxed.