I've noticed that I could run on the treadmill at a faster pace for about 40 minutes but When I run outside not uphill or anything I could barely run for 2 minutes without before being out of breath and needing to stop. It is pretty warm at the gym it is also outside but i run early in the morning so it's not that hot outside so What is the difference ?
The treadmill does a lot of the work for you. You notice you can't just stop running on one or you faceplant? Yeah, that's why.
It's a lot easier for me to run on a treadmill too. I tend to try to run too fast outside so I really have to focus on running slower at first and then I'm able to keep a better pace.