Kneel on one end of a mat. Kick your left leg out straight to your left side and lean on the right so all your weight is in your right hand and right knee.
Bring your torso level with the ground, keeping your right knee lined up under your hip, and your right hand lined up on the ground above your head.
Place your left hand on your hip and lean back slightly onto your right leg for balance.
Keep your torso steady and slowly lift your left leg up as high as you can, then slowly lower it within one inch of the ground and repeat.
Once all repetitions are finished, switch sides so that you are leaning to your left and lifting your right leg.
The kneeling side leg raise is a great Pilates move for toning the outside thigh as well as working your core. Increase your range of motion or add ankle weights to make this exercise more difficult. This is a perfect example of exactly the type of motions that are commonly used in Pilates that lead to the long and lean body type; it tones without adding size or a lot of muscle mass.