Wow!! I'd say that is a big contributor to your soreness. At 35 I feel terrible in the mornings from countless ATV mishaps, lacrosse, and of course a lifetime of amateur boxing. Painful hobbies. I can just imagine the shock that the human body must go through riding like that. Whiplash, sudden twisting and direction change, jolting joints. OK no more I'm getting sore just thinking of all that.