Running problem?

Question

I could run 20 minutes straight in the gym everyday. When I'm outside on rocky grounds and grounds that slope up a little, I feel tired much much faster. In the gym I get tired when I run for like 10 minutes or so but when Im outside, I get tired in like 4-5 mins?

Answer 1

your running on uneven terrain outside. of course your going to get tired faster, thats natural. dont worry about it

Answer 2

Treadmill running never really translates to the "real world" running. There are many factors that go into running outside (i.e. rocky terrain, inclines/declines, different weather, etc)

Answer 3

your body is probably not used to the running in the outside air, keep at it i am sure you will be able to last longer.