Amen, If you want to use a walkbehind and get the benefits of being worn out at the end of the day Go For It. Running behind a walk behind all day is not really that healthy of a work out. If you think its exercise you are dead wrong! Most workouts only last a maximum of 45 minutes to an hour, anything beyond that is breaking your body down farther than is appropiate. If you have conditioned yourself to a point that you can keep up with that walk behind for 6 hours or more its due to good operator technique. I will sit and mow and would gladly ride a crapsman before I would walk all day. Just my humble opinion though.