In this video from Livestrong we learn how to do a barbell full squat to increase leg strength. Find a squat rack at a gym and rack your bar a little bit below shoulder. In a split stance, come up underneath the bar and rest it on the back of your shoulders. Lift off, core tight, and step back away. Feet shoulder width apart, chest up, head up. In a sitting motion, come back down and then back up. Drive through the heels, abs tight. Down and up. Remember to keep chest and head up always and sit back in your "chair". Core and abs are tight always. Do anywhere from 6-20. Beginners 8-10 reps. When racking step forward, back in split stance, make sure you're in the rack and step away.
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