In strength training and fitness, the squat is a compound, full body exercise that trains primarily the muscles of the THIGHS, HIPS and BUTTOCKS, QUADRICEPS FEMORIS muscle (VASTUS LATERALIS , VASTUS MEDIALIS , VASTUS INTERMEDIUS and RECTUS FEMORIS ), HAMSTRINGS , as well as strengthening the bones, ligaments and insertion of the tendons throughout the lower body. Squats are considered a vital exercise for increasing the strength and size of the legs as well as developing core strength. Squats are typically used to hone back, thigh, and hip stability. If executed with proper form, the squat has the potential to develop knee stability too. On the other hand, if done incorrectly, injuries to the knees and back can occur.