Ive just found the start of it really slow. Practise jumping. Right now go here, ok now go there... and the only weapons i have so far are metal poles of one kind or another and my guy can only swing them like 3 times before he gets tired and has to back off.
-
As you get more into the game level wise, you will see your running and combat abilities enhance. Enjoy it while it lasts tbh, it is not as fun as you think it is being an OP survivor.