There is no single exercise for thighs that is considered the best, because a good thigh-focused workout routine consists of a variety of thigh exercises. However, squats and lunges are the most recommended exercises for thighs.
Squats are done by standing with feet shoulder-length apart, then squatting to a sitting position and standing back up. Lunges begin in the same position, but the next step is stepping forward and bending the knee of the front leg. Because the exercises are so effective and popular, there is a huge variety of different types of lunges and squats. The different varieties of lunges and squats incorporate weights, exercise balls and other exercise accessories to make the exercises more effective.