A3 Performance Center 888 E Belvidere Rd Ste 218, Grayslake, IL60030 A3 Performance Center is a gym dedicated to intense athletic training. The gym trains and prepares high school and…More college athletes. Specialized programs are available that are tailored to football, lacrosse, basketball, baseball, softball, track, wrestling and volleyball. The gym does not rely on stationary machines such as treadmills or elipticals. Instead, it has an assortment of free weights, open space and equipment for rigorous and serious training. A3 Performance Center offers personal training, group programs and CrossFit classes.