Measuring Cardiopulmonary Fitness - (and the Lack of it...) Every year I Race the Cat. That's not some bizarre pursuit of a furry feline but a brutal adventure-race triathlon in the Cataraqui region of Ontario - mountain-biking, kayaking and orienteering over 4 hours of self-imposed torture. As someone on the brink of his eighth decade, don't ask me why I do this because I don't know. What I do know is that each year the dream doesn't alter the reality, and there's always the chance I'll fall across the finishing line with a heart-rate of zero. But there's a way [...]