We had a fun time. The guides were very friendly and professional. Some physical exertion is required: one small uphill at the beginning and hiking from the river back up to the bicycles. My wife and I are in our mid 50's and had no problem other than some heavy breathing. I am not an off road cyclist but for the last 3 mile segment I felt comfortable enough to move to the front of the line and, much to my surprise, I found myself pushing the teenager in front of me. Nice adrenalin rush and an unanticipated pleasure. At the end of the day we discovered that our car key was missing. One of the guides drove us back to their equipment storage where we found our key. This was on his own time and money. Thank you.