Japanese sumo wrestling originated as a religious ritual performed at Shinto shrines and evolved into a spectator sport in the 17th and 18th centuries. Matches often last only a few seconds and end when one wrestler forces his opponent to either step outside the fighting ring or touch the ground with any part of his body other than the soles of his feet. Wrestlers generally weigh more than 300 lbs (135 kg) and follow a rigorous training regimen. What is the life expectancy of a sumo wrestler? Discuss