Ideas or plans that are quixotic are not practical and usually do not succeed.
By the time he finished his quixotic track career, Michael Oher would break the West Tennessee sectional record in the discus, and threaten it in the shot put. In his spare time! It came so easily to him, said Boggess, that if his talent for throwing the discus did not wind up seeming so trivial when set beside his other talents, “they’d have taken him away and trained him up and he’d have been big time.”
Lewis, Michael (2009-10-10). The Blind Side: Evolution of a Game (p. 68). Norton. Kindle Edition.
Definition from <http://www.onelook.com/?w=quixotic&ls=a>