Ante-post markets are formed by horse racing betting sites months before some of the biggest flat and jumps races. An ante post bet in horse racing is a bet placed long in advance of the race and it is risky wager. If your horse is not declared for the race for any reason (injury/going/poor form) then you lose your stake. On the plus side, you will usually get very generous odds when placing ante-post bets in comparison to when the line up of the race is finalised. Learn more about how to bet on horse racing above!