Exercising Rabbits
Most rabbit hutches are pretty small, and the rabbits need stimulation and exercise to be healthy and happy.
There are several ways to help with this.
First, you can leash walk your bunnies. It is pretty easy to train them to a leash and harness and then take them for a walk around the neighborhood, or the yard.
Second, you can make a bunny play-pen. This is what we do on our farm. Its a little lot wrapped with chicken wire. I usually put the bunnies out in the lot for an hour or two on mondays and tuesdays. I don't leave them there unattended since the rabbits can dig and I am a little worried they will escape or be hawk food.
You can also give them treats and different textures in their cages periodically. They make little chew sticks you can get for them to chew on, and you can also add different vegetables and hays and grasses to give them a bit of variety. Any little thing you can do to change up the day is great!