How NOT to Squat
8-time Mr. Olympia Ronnie Coleman said it best: “shut up and squat.”  After all, there’s nothing better for building lower body mass. Squats force you to use numerous stabilizing muscles and exhaust hamstrings, quads, and glutes.
To get the most out of squats, however, they must be executed with correct form. Avoiding these common squat mistakes will take both your performance and physique to the next level.
Mistake #1: Not Engaging Your Core
The core is the body’s center of gravity and is where movement originates. If you have a weak core, it will be much harder to keep the weight stable. It also places you at a greater risk for hip or lower back injury.
To properly engage your core when performing a squat, concentrate on sucking your belly button towards your spine. A strong core will be able to maintain this posture throughout the exercise. If you have a weak core, using a weight belt around the waist protects the spine and keeps you from relaxing the core.