The fourth of five boys. Robin Watson grew up in the Old South neighbourhood in London, Ontario. His parents were recreational runners; his mother ran track, his father marathons. His oldest brother Pete has been his greatest influence. Wanting to run like him, Watson entered a 10k race with him at age six. His endurance, and help from his brother, made him a top steeplechaser by the end of high school. He accepted a scholarship at West Virginia University where his brother Pete attended running in the National Collegiate Athletic Association (NCAA). After a year that saw WVU cutting its track program, Watson followed his brother to Colorado and began running track and cross- country for coach Bryan Berryhill at Colorado State University.[2]
He got a call from coach Dave Scott-Thomas, and on graduating moved to Guelph, Ontario, to train for the 2009 International Association of Athletics Federations (IAAF) world championships in Berlin. After a disappointing finish, Watson and his coach discussed him running the marathon. After struggling for success, Watson turned to his brother Pete who was coaching in North Carolina.[2]
He entered the 2012 marathon in Rotterdam but ran a 2:13:37 race and failed to qualify for financial support from Athletics Canada. In summer 2012, Watson moved to Vancouver, British Columbia.[2] Watson subsequently finished first in the 2013 Canadian Marathon Championships and second in the 2014 Canadian Marathon Championships.
Watson has coached at Mile2 Marathons for more than four years.[3]