Question....for those of you who spend most of your days on Zero turns. Does anybody have sore knees at the end of the day and/or bruising around your knees? Are your kness stiff after ridingg for a few hours? My do everyday and I am wondering if it is my knees knocking as I am riding or the vibration of my feet bouncing on the foot rest and affecting my knees? I would be interested in hearing from anyone who has similar or found a solution.