Just to be considered for SEAL training, you need to go through an incredibly hard selection process. You need to be physically fit, but the hardest part is mental. They want to see who has the stuff not to quit before they waste time training them. The mental element is the toughest part.
its extremely hard i think its like 1 in 10 make it you have to be physically fit they want you to be educated speek different languages fluently takes 26 weeks of pure hell i had a few friends try 1 made it. It's not like what you see on tv i tried me and 10 others dropped 12 days into training its a huge commitment both physically and mentally