Actually, I don't really agree with this. Acting also requires a lot of training and hard work. Actors have to practice daily, keep a watch on their fitness, rehearse before every scene, etc. Sometimes, actors have to shoot for whole night and day whereas players will definitely get the time to sleep whether they win or lose. Struggling actors have to go to the extent of sleeping with directors and producers (which is quite frequent in both Bollywood and Hollywood). They have to devote everything to become successful even if they are talented. Players, on the other hand, require talent, be consistent, devote their time and practice daily.
If you are saying in the context of big players like Virat Kohli and Dhoni, who we see in a number of advertisements daily, then I think you are not quite sure of the reality. Even players are trained before how to act and how to speak dialogues. Even most of the times, players do not speak really and they just do lip moments and the voice is of someone else. This is most prevalent in case of Virat Kohli. Kohli, never really speaks in ads but someone else does. And players have to give like a 100 shots before shooting as compared to an actor.
I believe every field requires a certain set of skills and a certain level of dedication, so we cannot really compare them.