Get Gunz: The Fastest Way to Build Your Arms...Guaranteed! The Get Gunz Program can increase the size of your arms by up to 1" in 30 days. Instructional door poster with training program and muscle building, fat burning meal plan. Instructional DVD with 3 different workouts programs. The Z-Strap training device is the perfect travel companion weighing only half a pound and rolls up to the size of a soda can. Door attachment secures the Z-Strap to any door in your home.