It is thought that pre-cooling in hot environments will improve endurance exercise performance by lowering an athlete’s preliminary core body temperature, thereby increasing the margin between the initial core temperature and temperatures at which athletic performance is affected.
How the first jet engine worked?
Jet engines can be dated back to the invention of the aeolipile around 150 BC. This device used steam power directed through two nozzles so as to cause a sphere to spin rapidly on its axis.