REASON NO. 9: TO BE CLOSER TO GOD!
This usually happens when I am running by myself and have a lot of quiet time, and I use it to pray to God about my safety, about the blessings He has given me, about my family, about anything actually. You can say whatever you want because God loves you and listens to you.
Running is a good outlet for quiet time as there is nothing to distract you here: no TV, no phone calls, no parents or friends to talk to you. It is just you for the next 30 minutes, the next 2 hours, or however you feel like it.
I also pray when I am in a hard race (say: BDM, Condura Marathon) and I pray that I get to the finish line safe and sound. I pray for strength and I pray for thanks, that I am able to run that day because not everybody can do it, and that is one of the many blessings God has given me.