Just like us, the best way to get a bun to slim down is to decrease calories and increase exercise.  Usually the best way to reduce calories is to limit pellets, with some bunnies to as little as a tablespoon per day.  Most veggies are fine, things like carrots obviously should be limited as well as fruit.  Oat hay and wheat hay have more calories than regular grass hays, you can limit those too.

As to making them run around more, we sometimes build little play areas for our guys, with boxes, wooden boards and we make bridges, ramps and box piles for them to climb on.  Another trick I learned from Dr. Harvey is to not give them their pellets in a bowl, spread them out on the floor and make the bunnies “forage” for them.  I do this with their greens sometimes too.

I don’t know about your bunnies, it seems they’re not as active as Layla is, but she LOVES to be chased. She also dances with me. It’s really cute, I’ll put the music on, and dance around her and she moves to the music too and is always facing me… Maybe won’t work for you, but it seems like an idea! Plus, it gets you moving too!

oh no bunnies on a diet! >.<
im not quite sure how you get a bunny moving, i know my guys run around and around in circles whenever i am sweeping my carpet, so if there is anything like that im sure that would burn calories?
I think veg is fine as long as it isnt the really fatty stuff, keep us posted! maybe you can take before and after shots? hehe