lance was a triathlete as a junior before he switched to the bike full on.
to the question tho...triathlon is definitely an expensive and inconvenient sport. not very lucrative either. a lot of pros are just failed athletes in other disciplines (usually running), but the best athletes have trained triathlon since they were young like KB and Vincent Luis. The best long course athletes are just short distance guys that transition over in the twilight of their career (just like 5k/10k guys that transition to the marathon).
The best runners arent likely to be failed runners and need to find a new sport, right? also swimming and cycling are probably pretty uncommon in Africa. Europe has a lot of triathletes tho so A lot of French, Spanish, Italians, etc.