His stuck moment:
After failing to place in the 1952 Olympics, Bannister considered leaving the sport of running altogether.
He goes for it: Instead of quitting, he challenged himself to reach the impossible: breaking a four-minute mile.
Unstuck result: After two years of training, Bannister ran the mile in a record 3:59.4 minutes at a meet in Oxford. He later became the first chairman of the Sports Council and was knighted for his service in 1975.
(All information comes from public sources and does not imply endorsement of Unstuck.)