You can't compare these sports as they are too different. Someone who would be crushed playing Rugby because they are small could be a very good cyclist and win the Tour de France, just as a huge Rugby player that is very good at rugby could never make it up the mountain on a single day in the tour de France. You'd have to be more specific at what you are looking for.
Why not throw in ice hockey, waterpolo and elite level chess, as well? Those comparisons would make as much sense. Or be equally meaningless.
In all 5 sports/events the people condition their bodies in different ways so, it is difficult to compare.
Triathlon is tough but unlike American football your not getting smashed by 260lb linebackers who want to take your head off!! American football players have to deal with the fact that on any play they can be seriously injured, paralysed or worse!! At Triathlon is a mental battle with one's self more than anything. Tour De France requires greater endurance than Rugby but again Rugby is a contact sport so players have to be tough enough to endure the contact...cyclists have the luxury of not getting hit!
Rugby (League)
