SQUATMAX-MD IS THE ONLY BELT SQUAT DEVICE ON THE MARKET PROVEN TO ACTIVATE THE LOWER BODY MUSCULATURE SIMILARLY TO A BARBELL!!
Gulick DT, Fagnani JA, and Gulick CN. Comparison of muscle activation of hip belt squat and barbell back squat techniques. Isokinetics and Exercise Science 23: 101-108, 2015. https://content.iospress.com/articles/isokinetics-and-exercise-science/ies570
Additionally, in a Recent Head to Head Independent Belt Squat Design Study, Squatmax was shown to be the superior choice at maximizing the entire lower body musculature!
Figure 3. Quadriceps EMG