Worldwide, too little iodine in the diet is the most common cause of hypothyroidism. In countries with enough iodine in the diet, the most common cause of hypothyroidism is the autoimmune condition Hashimoto's thyroiditis.
The pronghorn is the second fastest land mammal in the world, after the cheetah. It can attain speeds of over 53 miles (86 kilometers) per hour. Size relative to a 6-ft (2-m) man: Fleet-footed pronghorns are among the speediest animals in North America. They can run at more than 53 miles (86 kilometers) an hour, leaving pursuing coyotes and bobcats in the dust.
The official Spin site claims a person pedaling at an average rate of 80 to 110 revolutions per minute for a 40-minute class covers approximately 15 to 20 miles. Based on this estimate, youâll cover between 22.5 and 30 miles in an hour if you go at an incredibly aggressive rate.