was it roid rage?
i think i know know why leicester is so good this season.
there were rumors but now it's official! the leicester players are on steroids
EPO and various other mechanisms of blood doping do help sustain fitness, which, in turn, affects the consistency of concentration.
I hope this Leicester fairy tale isn't a result of doping or steroids, but I'm pretty cynical after the whole Lance Armstrong bullshit
Steroids are used to either aid long-term injury recovery or to aid training, so you can increase your ability to train and perform. Vardy is not incredibly muscular so it is unlikely he would be using roids to increase his ability to train, and has no long term injuries I am aware of. If he was doping it would be some form of blood doping eg EPO to increase cardiovascular performance. ie even if he is doping he probably isn't using roids so don't be a melt
You do have to literally sprint around a field for 90 minutes though, which is half of what Leicester are known for. If it made Lance Armstrong a better cyclist, it can certainly make you a fitter footballer.