Thigh muscles are worked by using either the Central Section or the Kneading Rings. Experiment to see what feels best.Use the Central Section while sitting up, rolling it back and forth over the quadriceps (front thigh muscles). Also while sitting up, you can place the Kneading Rings under your hamstrings (rear thigh muscles), and let the weight of your legs help work out the tense spots.
You can also lie on the Kneading Rings on the quadriceps muscles or iliotibial band (IT band on outside of thigh) and let the weight of your body help work out the tense spots.