Definition of fit or fold
Fit or fold refers to a player's style of play on the flop. We will refer to this as a fit or fold player. A fit or fold player is a player who, if he does not hit the flop, folds. If he hits, he continues. In poker, the majority of the time, you don't make a good hand on the flop. Especially when playing heads-up, you have to be aggressive, make flops, check-raise bluffs, in short, be creative. A "fit or fold" player is a passive player who will be easily taken advantage of. You don't want to be that player.
Identify fit or fold players
If you suspect a player of being a "fit or fold" type, take notes on him and exploit this tendency. Against such a player, don't hesitate to bet on every flop, even if you didn't hit. A small bet will often do the trick. And if you get resistance from a player who is fit or fold, you know that unless you have a very big hand, you can fold your hand without fear of having made a bad fold. Fit or fold players are often beginners or losers.