I've been training a long time. Currently doing Crossfit at an affiliate 3 days/week and doing 5/3/1 throughout the rest of the week. My numbers are DL 475, Squat 385, BP 330. I have a power rack in my garage and would like to incorporate bands/chains into my DL, Squat, and Benchpresses. What's is a good resource for getting started? I have limited knowledge but definitely see that it could benefit me. Thanks