The best exercise for the butt and thighs are squats, lunges, single leg squats and step-ups.

There are a number of different exercises that target these muscles, including squats, single leg squats and lunges.

Start using one leg to do 10 x single leg squats, then switch the direction you are facing and repeat on the other leg.

To assess hip stability, Smith points to one- legged squats.

For more challenge and stability, upgrade to one- legged squats, or one-legged squats on a Bosu ball.