At 50, the legs and feet that have undergone an estimated 35 surgeries hurt too much when she gets up on her toes and pushes the pace. -signonsandiego.com
MY COMMENT: Mary Slaney was a talented runner (she set 6 world records in 1982 from 1 mile - 10 K) but her imaged was tarnished by the 1984 Olympic debacle (the Zola Budd incident), and finally when she tested positive for high testosterone levels in 1996. She was cleared by USA Track and Field the following year but not by an IAAF arbitration panel, who stripped away her silver medal won at the 1997 indoor world championships.
Oh yea, and she had her share of injuries and lower leg problems.