How do I train my rabbit agility?

My bunny doesn't walk on a leash very well. When I go on YouTube and watch bunny jumping competitions I see they use a leash and do many jumps in a row without hesitation. The only time he will go over a jump is when I'm wearing my fuzzy slippers that he wants to hump on the other side of the jump. How do I train my rabbit to go over jumps easily and not have to push him over or with wearing my fuzzy slippers. I have a clicker and if I need treats then I don't know which treats because my bunny doesn't usually eat outside of it's cage.