I met Alex Hetheringtion several years ago in Okinawa, Japan. He was a good runner back then, running under 2 hr 30 min on a tough Okinawa Marathon course. Now 42 and a Lieutenant Colonel, he's a Cobra pilot in the US Marine Corps, and is still a pretty good runner.
I'd guess Alex is around 6'5", and according to the Marine Corps Marathon website, his weight is listed at 190. Big for a marathoner.
This year, his 15th Marine Corps Marathon, he finished 3rd in the 40-44 age group running 2:41:49. His long history in this race, including a 10th place finish in 1995 and several in the top 20, has earned him the honor of being the first active duty inductee into the Marine Corps Marathon Hall of Fame (Navy Times).
I almost forgot to mention- Alex, who has been deployed to the middle east at least twice, is the father of 4 including triplets! (see article here about his wife and family).
Alternate pairs of running shoes, preferably different models/types. Having the right shoes for the workout or surface you are running on will allow you to achieve the best possible fitness and footing. Additionally, since each model/type of running shoe fits your foot and engages your muscles in different ways, if you are experiencing a persistent localized ache or pain, the first step should be to run in a different pair of shoes. The results may be surprising.
source: Training Tips from Lt. Col. Alex Hetherington