Really, repeated efforts over a base level?
Full gas?
Being able to control a spherical object at speed while being tired?
The reason triathlon, decathlon, etc exist is because people refuse to accept any other individual sport could be as hard as the sport they're shit at is.
The gains available by doping in football are considerably smaller than in cycling, certainly when we’re talking about EPO.
There hasn’t been a period in football when doping has defined and shaped the game.
That’s the difference.