<human>: Condense the text into a few key points

I have a round pen which I lunge my horses is. It's roughly 35 feet in diameter. There's already a "track" around the edge made by my horses so I don't see why I couldn't. 

I know what you're thinking, "Couldn't you just run on the road or at the gym? Heck just buy a treadmill!" Well, where I live there are bears, black bears and grizzlies everywhere. You can't drive up the road with out seeing a couple. Plus momma bears and their cubs populate the area. As to why I can't go to the gym, my town of 600 people has no gym plus if it did it's 45 minutes away. I'm also to cheap to by a treadmill and they suck.. I don't like running in one spot. 

Would it hurt my legs or anything in anyway running in the round pen? It's dirt and gravel by the way.
<bot>: I have a 35 diameter round pen packed down with dirt and gravel. Would it be okay to run in there? Yes.. Run in circles.