There's no doubt about it; Footballers are faster, stronger and fitter than at any time over the last 100 years.
Today's game moves at such an incredible pace and players cover so much ground that they are almost two to three times, if not more, fitter than their counterparts of yesteryear.
If you've ever had the chance to watch an old game from the 1950s through the 1990s, you can see how much slower the game used to be back then. For example, Brazil's 1-0 win over England is hailed as a classic match, pitting Bobby Moore against Pele.
Compare it to one of today's matches and it is almost unwatchable.
In fairness, the game has moved on incredibly over the last decade, never mind the last century. Sports Science is the new black. Players are trained, moulded, analysed and scientifically scrutinised like never before.
Back in the early 1900s players barely trained, and when they did it was often without the ball. The thinking back then was that it made the players hungrier for the ball come matchday!
Fitness isn't the only part of the game that has evolved. Believe it or not, technique and tactics have also improved over the years, along with more underrated advances, such as equipment, boots and even pitch surfaces.
So the question has to be asked: How would the superstars of the past fare in today's game? Who would succeed and who would struggle?
That is not to say they aren't legends. They are and they truly deserve to be. I just feel that they might find it harder to adjust to the modern game than some of their counterparts.
Here I look at 11 of the game's legends who just might struggle in today's football climate.
Read on and don't forget to leave your comments in the section below.