Well I was commenting more on the very large training volume versus 30 hours a week. For running, most people out of shape get gassed and probably puke in about

Well I was commenting more on the very large training volume versus 30 hours a week. For running, most people out of shape get gassed and probably puke in about 5 minutes running around the block, and when you are in great running shape its not like you are really running for hours either unless you are endurance training. With biking, you end up with the endurance to ride for an hour or two or longer in one stint pretty fast because its such an efficient vehicle. If the goal is to burn calories before work, a bike is pretty sucky for that unless you are doing hill sprints because its going to take too long compared to running or other activities that can burn the same calories in a fraction of the time.