Endurance is built, not born. It isn't gifted to you, served on a nice platter, or granted to you by a magic genie. It's built into you as you build yourself. It's not a consistently available trait, it burns like a fire and it must be fed, harnessed, and utilized every day; and as you grow, it grows. Day by day, week by week, month by month, year by year. Attack the day - be built to endure.