The Core X System As Seen in Sports Illustrated The Core X System was designed by Alex McKechnie, the Performance Coordinator for the LA Lakers. Alex uses this exact system to train the Lakers and many other professional athletes. Easy to use system uses the X effects to lean and tone abs, buns, hips, waist, thighs and your core. Using standard movements the Core X will provide you with a full body workout in minutes per day. Included in the system is Alex's personally designed workout DVDs, a diet book and travel bag.