I had serious back injuries last year. I thought I was in shape, running and lifting 3 or 4 days a week. But the reality was, I wasn't working out right, in a way that benefited my sport. I spent a few bucks and hired Marcus Browns girlfriend, Jenny LaBaw, to assist me in my condition. She is a fantastic trainer and she does it all online for $75 a month approx. The workouts she gave me were meant to make me a better skier, and for the first season ever, I never had a single back issue, no pain, no problems. She had me doing a ridiculous amount of core, inclusive of numerous deadlifts, both one legged (for balance), and two legged for core and hamstrings. I had my best season of my life. In addition to the core work, she spent a considerable amount of time on leg strength, both squats, lunges, box jumps, etc. She is fantastic! I highly recommend her for any skier.