Question: how to make running long distance easier?
Answer: Shorten Your Stride. It's counterintuitive, sure, but shortening your stride and aiming to take more steps per minute (180 is ideal) can help you run more efficiently. ... 
Look Ahead. ... 
Lean Forward. ... 
Get New Shoes. ... 
Relax Your Arms. ... 
Break Up Your Runs. ... 
Dress Comfortably. ... 
Drink Up.