I guess I am infirm and unfit. I just climbed a 60 foot tree yesterday and took it down. I crawl under houses to fix plumbing and I haul asphalt shingles up ladders. I also haul 300 lbs of construction equipment on a trailer behind my electric bike. Up STEEP hills. I am only 53 and I am sad to hear that I am now infirm and unfit. I guess I should drive my truck everyday and only have a bike for recreation like a 'real' cyclist.