The King of Pain is a challenging road race presented by the Glastonbury River Runners Club in South Glastonbury, Connecticut. Known for its hilly course through scenic orchards and winter conditions, the event is considered one of the toughest local races. The course is open to traffic, and participants should be prepared for possible inclement weather. Registration includes chip timing, a long-sleeve tech shirt for early registrants, and post-race food, with proceeds benefiting Achilles CT and Sunshine Kids. Awards are given to top male and female finishers and age group winners.