If you're going to run outdoors, please, don't run barefoot.
- Your joints will thank you (less impact on the joints).
- You've avoid dangerous objects on the ground (broken bottles, glasses, etc.)
- Without safety worries on your mind, you can focus on doing what you love to do: running.
- And other reasons I cannot currently think of.
That being said, this source details how to improve your running, barefooted or not. The highlights are simply:
- Your Stride: Covering more distance with each stride is optimal.
- Your Footstrike: Landing on your forefoot is better for your performance, but it might be hard on your calves.
- Your Posture: Looking ahead of you and not on the ground is optimal.
- Your Arm Posture: Less arms swing is optimal.
- Your Bounce: Reduce your bounce between each stride to reduce the energy expended and to conserve your energy.
Keep running :).