Dr. Holmes is also a running fanatic, and has run over 77,000 miles including over 335 marathons or ultramarathons (ranking 48th among all-time US runners and 236th in the world). He is the only person to have completed this combination of 191 marathons: three marathons in every US state and DC, two marathons in all 13 Canadian provinces and territories, and two marathons on every continent. In 2010, he was 2nd in the over-60 category carrying a 35 pound back pack through the desert sands of the Bataan Death March Memorial Marathon; in 2011 he won the 60 and over category in the 50 mile trail run at the New Jersey ultra festival; and in 2012 he won the 60-and-over category in th Egyptian Marathon in Luxor and the Hogeye Marathon in Arkansas.