Walking: It's the simplest method of toning the thigh area. To reap some of the benefits during your daily schedule, simply avoid parking as close as possible when going shopping or to work. Give your body a chance to adjust to greater walking distances. This will eventually lead to increased endurance and thus increased ability to tone the legs.

Stair-stepping: Whether at work or in a gym, climbing stairs is an excellent way to target the thigh area. The stair-steppers in the gym provide a fat-burning and muscle-toning workout that will contribute to the development of lean, fit legs. If you don't have access to the stair-stepper machines, you can perform the toning aspects of this workout by using old-fashioned stairways. Simply by choosing stairs over lifts or escalators will make a noticeable difference in your leg muscles.

Cycling: Distance cycling and mountain biking are great outdoor activities that provide both a great cardiovascular and toning workout. The energy required to perform these sports will help whip the thighs into shape. Just check out the iron thighs on Lance Armstrong and other Tour De France athletes.

Swimming:  The constant kicking in swimming provides an outstanding workout for the thighs. The variations of swimming styles provide multiple workouts for the thigh area.

The Guardian