Having trouble running your first 5K or 10K? Ever wonder how some runners can keep running as if they weren’t getting tired? For beginners, long distance running can be an intimidating and exhausting challenge but the trick isn’t to jump straight into long runs, but to build up to it.

When it comes to running, fatigue and exhaustion are common complaints, even for the most experienced runners. Aerobic respiration aside, there are several reasons why you feel tired and need to take a breath after running a certain distance. Some of these factors include dehydration, weather conditions, and your physical fitness.