Barry Allen built the Cosmic Treadmill so that he could travel through time by use of super-speed. It was powered by cosmic rays and was coordinated with radioactive pulses from a cosmic ray clock. It released positive radiation when moving forward, sending its user into the future, and negative radiation when moving backward, sending its user into the past. Near the end of its construction, Barry had only one bug to fix. The positive radiation which sent him into the future caused an electro-magnetic reaction in his body, charging him with positive ions and making him a living magnet.