When you have lost some fat from your thighs you can think about resistance training. If you need to increase muscle mass in order to increase the shape and definition of your thighs you can implement resistance exercises. In order to have fantastic legs you need muscle. Therefore, if you lack shape having lost weight, a program of resistance training targeting the legs will help to shape and firm them. Be sure to keep the weights moderately light (up to 70% of your one-lift maximum), so that your thigh muscles become harder, stronger and more defined, but not significantly larger. In other words, focus on completing more repetitions, with less resistance. Those who have the type of muscle (mesomorphs) that responds quickly and gets big need to be particularly vigilant and may not choose not to do any such exercises, since their thigh muscles are already well toned.