Is my rabbit having enough exercise?

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My 2 bunnies have a 6ft run attached to their hutch so they have 24 hour access to that, and I have started this week letting them loose in the garden.

They love the garden i have covered plants that i`m not to sure about with sheets etc and they just love it running free and exploring.

the only down side is they`re not to chuffed about going back in to there hutch, what suggestions do you have on getting them in!!!!!!!

I always get my buns in when it's dinner time! Then they soon learn that going in means food Mine have always had free run of the garden, although there is the risk of thorns causing abcesses (had that one twice!!) they are very happy + can behave like bunnies