On betting exchanges like Betfair, the Over/Under 2.5 goals markets are some of the most liquid. This makes them a popular choice for goals-based betting strategies, like the Under 2.5 goals strategy. This straightforward strategy involves betting on there being no more than two goals in a match. It can be a relatively low risk system when the two teams facing each other are defensive, and unlikely to go for many goals. As before, when you get in and out of this makes a big difference to your bottom line.