Governing bodies USA Track and Field (USATF) and International Amateur Athletic Federation (IAAF) ban footwear with springs in sanctioned competitions to avoid any unfair advantages.
The ban prevents Spira Footwear from using high-profile runners to promote its brand and its patented spring technology. Spira hired Leverage Agency to raise awareness of its technology (which it says reduces impact and helps recovery) and increase sales.
Spira pledged $1 million to any runner who could win the 2006 Boston Marathon in its shoes. ...