The reward dilemma.
During training for many different kinds of animals a treat is used as a positive reinforcement when the desired behavior is exhibited.
Unfortunately rabbits have a delicate digestive system that can be thrown into chaos by sugary treats therefore treats are not recommend as a positive reward mechanism for rabbits. If you really want to use treats as a reward you should consider using the greens part of the bunny's dinner as the treat.
The recommendation for positive rewards are a soothing voice using a reward word, scratches, and pets.
Keep in mind picking the bunny up or trancing immediately after successfully completing the requested agility behavior is a negative feedback to the rabbit, so don't do this.Have a good day