The tension of resistance provided by training aids, means that more muscle fibres have to be used to overcome that extra resistance and muscle strength is therefore increased. It is also easier to isolate the muscle with the assistance of a training aid. Muscles that are more difficult to tone or seem to take bit longer to shape, can be stimulated better with training aids and fewer repetitions will be needed, for example the inner thigh (adductor muscle).
Great tips to strengthening the inner thigh buttocks and lower back:
(Purchase a small round plastic ball, a ball slightly smaller than your average size soccer ball).
Lie on your back, on the floor/a flat surface, head flat and knees bent.
Feet are on the floor and pulled half way up towards your buttocks.
Feet are hip width apart and toes are facing forward.
Place the ball between your knees and squeeze the ball and release the ball ever so slightly. Repeat this movement 24x.
To increase your strength and development, squeeze for 8 and then hold the ball tightly for the count of 8. Repeat this movement 4x.
As you get stronger, to strengthen your lower back and buttocks and work your thighs at the same time, strengthening your pelvic floor area too, lift your buttocks up off the floor, squeezing the ball at the same time and tilting your hips forward so that your back is not arched and pulling in your stomach, now squeeze and release for the count of 36, without the ball dropping to the floor.
When you are lifting your buttocks up off the floor, be careful not to hyperextend or arch the back by pushing upwards too high. Use your thighs and buttocks to hold you up while you squeeze the ball with your inner thigh and inner knees. By keeping the buttocks up and pulling in the stomach your whole lower body area is being strengthened.