A portable human balance training device for improving the human proprioceptive system, athletic performance, athletic speed, athletic agility, athletic vertical leap, athletic eye/hand coordination, spatial awareness, left/right brain organization and increasing the muscular development of a user. The balancing device has an elongated suspended support structure spanning the length of the device. The balancing device also has an end support structure at each end for suspending and stabilizing the support structure. A flexible line is mounted to the end supports and spans the length of the support structure. The user places all or part of their body weight on the suspended support band and attempts to balance.