Looking for some advice regarding picking a training strategy. I'm 59, retired Army, but have been off the bike for several years due to some injuries I suffered. I picked up a copy of Maffetones "Endurance Training and Racing" with hopes of getting back into doing centuries and brevats next year (2014). Any thoughts on his methods, especially the lower hr training he talks about? Seems most people are into the intervals and higher hr rates, so trying to get some advice based on experience.