why is that so hard to believe?
it is a requirement in the u.s army to do 5 miles in around that amount of time.
bench
add the ability to divide something else getbiggers lack
5 miles in 20 minutes is 5 consecutive 4 minute miles. Fastest mile time ever is 3:46 about. Clearly, it is not outrageous to assume there are few people on this planet who could run 5 4 minute miles.. if any
5 miles in 30 minutes is 5 consecutive 6 min. miles. While this possible, it is only possible for someone at the top of their running game. This is NO EASY feat coming from someone who used to run cross country. I used to easily run two miles in under 12 minutes (two sub 6 miles) and I definitely could not run 5 consecutive 6 min miles.
And I googled the Army requirements for a RANGER -- I'm sure tougher requirements than the normal army cannon fodder
2 mile run in running shoes in 15:12 minutes or less. That's 7minutes 36 seconds a mile. Far cry from what Bui is doing.