What is it that makes you able to have more stamina?

Running does, but how? There are fat people who can run all day but skinny people who can't run a block, so it isnt weight

What is it that makes you able to have more stamina?
The muscles in your legs get bigger from running becasue when your muscles are tired it's actually telling you to keep going because that is when your muscles will get bigger becasue the demand for them is higher. and "big" people could be mostly muscle! and skinny people could be just skinny and without much muscle. Then you get the people who are skinny and muscular from no work and those who get stronger from hard work. this may not've helped but i was kinda bored :)
Reply:ive never seen a large person run all day...

smoking has alot do with some skinny people

not being able to run at all..
Reply:you build enduarance training/practising - fat people do NOT have high endurance because they have to carry all that extra fat around all day long.

cardio, strength training and weight training and self discipline does help.
Reply:I have lots of stamina and i can t even run for more than 5 minutes but im unbelievably strong. Try drinking couple shots of hennessey,for about a week if you drink or what ever drinkyou prefer. where im from thats the last thing we would ever be worrying about we also have different drinks over here just for that. alcohol increases cardio strength ive tried it it really works. oh yeah and i smoke occasionally ehehe. and i still can walk miles and strength train all day everyday!