I have recently "inherited" a 25 year old Quarter Horse. He really is a good horse, overall he seems to be in good shape as far as I can tell. He hasn't been ridden in 2 to 3 years. And he has only been ridden off and on throughout his entire life. I lead him around yesterday then rode him for about 15 minutes (just walking) and he did really really well. Should I just let him love his pasture life and leave him alone? Or is it okay to ride him twice a week (nothing vigorous - of course)??? I need help!?!?!? Am I doing the wrong thing by riding him?