The squat is performed by squatting down with a weight held across the upper back and standing up straight again. This
is a compound exercise that also involves the glutes (buttocks) and, to a lesser extent, the hamstrings, calves, and the
lower back. Lifting belts are sometimes used to help support the lower back, as are tight-fitting "squat suits" which
compress the lower torso.[citation needed] The freeweight squat is one of 'The Big Three' powerlifting exercises, along
with the deadlift and the bench press.
Equipment
Squats can be performed using only the practitioner's body weight. For weighted squats,
a barbell is typically used, although the practitioner may instead hold dumbbells, kettlebells,
or other weighted objects. Individuals uncomfortable performing freeweight squats may use a Smith machine or hack squat machine. -Wiki-