How to use running action/animation when object moves?

Ok so i have my object which is a space marine blood angel (just incase you where wondering) and i have a plane set up as the ground and i have used logic bricks to control the movment of the object so now i need some advice on how to use my running animation when i press the key to run. If anyone can help me with this i would appriciate it so so sooooooo much cause then i can get started on my game! Thank you!

it would be great if someone could help me out…

On your model armature:
Key sensors(Key you use to move) —> controller(python or and) ----> Action actuator (Your running animation)

That would be the quickest way.