Thigh
-Isometric quadriceps(quad sets). you lay on your back with your leg extended, Tighten the quadriceps muscle on the front of your thighs by trying to push the knee downward. so in other words you flex your quad and hold it.

-TA activation, active SLR. ( straight leg raises)lie on your back with your leg straight. you slightly lift one leg (about 6 inches), keeping your leg straight, and bring your leg back down.