13. Triathlons
The ultimate test of human endurance, in real life at least. In GTA, triathlons are a lengthy method of testing a players ability with three game mechanics swimming, cycling and running, in a race against NPCs for pride and profit. Given that the world of GTA5 is said to be much bigger than anything Rockstar have ever offered before a bold statement given the size of San Andreas and Red Dead Redemptions maps, the return of triathlons would be an excellent way to introduce elements of the city and countryside underutilised by other missions.