Introductions: Hi. My name is Matt Kretchmar. This blog is to document my year-long journey to chase a fitness goal of running a sub five minute mile again at my advanced age. I decided to set a new fitness goal for myself -- to give myself one year to train to attempt to break the five minute mile barrier. I do have a running background. From age 27 to age 33 I was a serious runner, training with a coach, running year round, logging 7 to 10 runs per week, usually in the 80 to 100 mile per week range. I mostly raced marathons, but during my training I would regularly run 5 minute miles, mostly as speed work on the track. 4:59:04 I think my last recorded 5 minute mile was at age 32. Next year I will be 52. So there will be a 20 year window of age, time and body changes to overcome. I basically stopped running at age 33 when my daughter was born. I was burned out of serious training and needed a change. So I switched to mountain bike racing. I did 100 mile mountain bi