Is your squat progress stuck? Studies show that using a weightlifting belt can increase power production in the squat which may allow you to lift more weight. This study also found that using a lifting belt does not lower core muscle activation like many people think. Take a big belly breath and locate the area your stomach inflates the most – this is where you want to wear your belt. Take a big breath and push your stomach hard into the belt to get the most support for each lift.
Reference: Zink, A. J., Whiting, W. C., Vincent, W. J., & Mclaine, A. J. (2001). The effects of a weight belt on trunk and leg muscle activity and joint kinematics during the squat exercise. The Journal of Strength & Conditioning Research, 15(2), 235-240.