Lazy during floor time?

I've had my two girls for over a year and at first I understood why they didn't do much during floor time even when I setup little veggie runs for them. They weren't used to floor time yet so that was understandable. About a couple months later they started walking around and everything without veggies but after ten minutes of walking around talking to each other they'd just sit in the middle of the pen.

So flash forward to about a couple months ago. The two girls started gaining extra weight because of how short of time they'd walk around, not even run. One is two ounces over weight and the other is three ounces overweight so I'm concerned.

I'd like to know how to try and get them to run during floor time and exercise more. I do hear them occasionally, and by occasionally I mean rarely, running laps in the middle of the night around their cage too. I'd love any suggestions to get them active in their floor time - or while they are in their cage too. Thanks for reading.