keeping goats fit

[rockman]

Hi all. I would love some advise for keeping my goats fit. I would like to get them into the hills packing once a month for two or three days. My problem is what to do to keep them in condition. I live quite close to town so taking them for a walk along the road is not an option. This means taking the goats and all there gear in the trailer to the local beach. I've found this very hard to do in winter months with short days and a busy scheduled.
I was thinking of building a treadmill or something like it ?
Has anyone come up with anything to help with general fitness.