Chris Grayson is by far the most knowledgeable professional in this field that I have ever crossed paths with. ┬áChris has been educating me with training advice for over a decade, and he played an important part of my recovery process from knee surgery earlier this year. Chris is an encyclopedia of my countless questions and he is full of answers based on empirical evidence. If you’re in the Chicagoland area be sure to check out USI.