We have two horses at my barn that like to 'spurt' after a jump. Both listen perfectly on the flat, but the jumps get them a little off; one is nervous, the other excited. We have the same exercise for both.
Start with a single jump so that you don't have to worry about how long it takes you stop afterward. This is best done in a field or very large ring where you have lots of room to get the halt. Start by trotting into the jump and asking for the halt two to three strides after you land. Make sure you're halting on a straight line. We've found that putting a cone on a straight line in front of the jump can help if your pony likes to veer off. Just put it far enough up that you won't run it over it the pony doesn't stop in time :) When you feel comfortable canter the single and to get your halt in the same amount of time/striding afterwards.
Once you're consistently halting within five to six strides after the jump add a second one in. Give yourself at least a seven to eight strides between the jumps. Start by trotting into the first one, halting in the middle, and then trotting the second one. Once you're good with that, canter the first, halt in the middle, and trot the second.
It keeps the horse paying attention to you and thinking about what you're asking instead of focusing on what they see in the ring/field/trail/etc and assuming. It's a lot of work and takes lots of patience, but it is well worth it to have a pony or horse that listens to the aids no matter what they /anticipate/ you wanting.