This Saturday I rode my XT225 on my first ever off-road ride. It was 10 miles with about half on straight power line trails there were sometimes muddy and half in twisty woods on ATV trails that were also muddy. This was on Saturday. That evening my back was hurting a lot and by 8:00pm I had no energy left for anything. The next day my back felt a bit better but still hurt some. My energy level was lower than usual and by 8:00pm I was again exhausted. The riding really took it out of me. I've ridden these same trails many times on ATVs and never felt like this. I'm in my late 40's. I know a lot of you guys are my age or older. What do you do to get in shape for riding?