I'd probably ride in it, you may have to limit what you can do but with the length instead of riding a circle, just ride oval if the sport you do requires to practice your circles, just practice it when you get the chance (another arena). The indoor arena I normally ride in is 80 wide by 160? and even tho its wide enough to do circles I'll still do ovals just to make sure the horses are awake and paying attention and that I can easily guide them and it's not them just being used to doing circles!
I'd more a less be worried about the height, I'd defiantly want to make sure if a horse was to rear the horse nor myself are going to end up hitting the roof.
Home To: Pearl - 2010 AQHA Cremello Mare, Chloe - 2012 AQHA Dunskin Mare, Wyatt - 2015 AQHA Dun Colt.