Soccer players may have more stamina, but in regards to measurable athletics they aren't in the same ballpark as NFL/NBA players.
Ie. it would be a lot easier for someone like Russel Westbrook to increase his stamina than it would be for Ronaldo to match's speed, strength or vertical.
id say nba players stamina could match soccer players, soccer for the most part is just short bursts here and there, its not constant running up an ddown
Soccer players may have more stamina, but in regards to measurable athletics they aren't in the same ballpark as NFL/NBA players.
's speed, strength or vertical.