With ACSM certification, a degree in health and exercise science, and more than 1,400 track and road races under his belt, Burt McLachlan knows how the body moves. He draws from more than 17 years of training experience to build boot-camp classes at Cross~Stream Fitness, gathering students in a spacious indoor arena for constantly changing routines. His medley of cardio, strength, speed, core, and flexibility drills includes lifting weighted bars, which conditions upper-body muscles, and playing volleyball, which conditions hands to bat away meteors. Burt believes in the power of positive thinking ; he both gives and gathers feedback from his boot-camp groups to plan future classes.