Whats SP and its usage?

[Spodi]

i guess... but it's not like you'd have to run for 10 hours straight if you have a car or if you're just slaughtering people in town centre

You keep changing the situation. You're not going to have to run in the game if you're slaughtering a group of people, either, and I'm sure you won't use SP if you were driving a car in the game. You run in life, you get tired. You run in the game, you get tired. Simple as that. :wink: