According to Sportinglife360.com, the world's deadliest mainstream sport is fishing. In 2005 alone, 187 people died while fishing. The primary reason fishing is so dangerous is it occurs in close proximity to water, which leads to drowning deaths.
Another deadly sport is horseback riding, which kills 100 times more people than boxing does. According to Sporting360.com, 128 riders out of every 100,000 riders die each year. Base jumping, the sport in which participants jump off buildings, antennas, spans or cliffs and slow their fall with the use of a parachute, is very deadly as well, killing an average of six people per year.