The cycle continues as the mass vibrates back and forth about a fixed position. The springs inside of a bed mattress, the suspension systems of some cars, and bathroom scales all operated as a mass on a spring system. In all the vibrating systems just mentioned, damping is clearly evident.
[Continued from above] . . . Contraction of the quadriceps group extends the leg at the knee and flexes the thigh at the hip. The hamstring muscle group extends across the posterior surface of the thigh from the ischium of the pelvis to the tibia of the lower leg.
Toning your inner and outer thighs means working your thighs, hips and butt muscles. Common trouble areas, the inner and outer thigh muscles can be targeted by specific exercise machines. The outside of your thighs are where the hip abductor muscles are located; they help move your leg and hips away from your body. Conversely, your hip adductor muscles help move your legs inward, toward your body.