Hashimoto's thyroiditis, also known as Hashimoto's Disease or chronic lymphocytic thyroiditis, is an autoimmune disease in which the body's immune system attacks the thyroid gland.
But year after year, 15 captains of 15 teams fail in their pursuit of such a lucrative prize. The Stanley Cup is without a doubt the hardest championship trophy to win in all of professional sports. Harder than winning the Superbowl, harder the winning the World Series, and harder than winning the NBA Title. There are 16 teams in playoff contention, only other sport that can claim the same would be the NBA.
Best Answer: Individual endurance sports are going to be the toughest, physically I think. In team sports you often get a chance to rest, so it's more intense for periods of time, but also low intensity other times, and there's time outs, etc. If you're running a marathon, you don't stop, you just keep going. So, I'd probably have to go with some ironman competition as being the hardest.