The man is into riding his bike for health reasons. After turning 30, i think he puts on weight alot easier, usually if the weather is cold, he exercises on the stationary bike that we have at home but during the summer.. and late spring, he would be jolly about bringing out his mountain bike and go riding for an hour or so. Being asthmatic and all, one cannot be too careful, so a pulse oximeter, is always with him during his biking outdoors. The one that he has is hospital-grade accurate, and very affordable, so I’m happy and so is he, afterall, he hates it when i keep nagging him.