In order to improve your gameplay you must learn to sprint properly.Sprinting gives you force ,surprises the enemy and gets you faster anywhere.But also may get you killed.
A good tip for sprinting is to never sprint inside buildings-You have to sprint only in open spaces when there are many possibilities for the enemy to spot you and take you out with a sniper or rifle.Inside buildings and close spaces you have to walk carefully especially when passing a door and entering a room.An enemy may guards the place and take you out easily.When sprinting you need much more time to aim down the sight than someone who camps or walks.That's a huge disadvantage in a gunfight.(see tip no 23). The only time you may sprint or jump when entering a room is ONLY when you know exactly where your enemy is (especially if marked with recon,or flashed with a grenade), and your enemy also knows your position and that you are about to enter the room. Someone flashed may pre-shoot in order to get you by luck or prevent you from entering as he is flashed and knows he is a sitting duck.That way you may surprise him and enter fast (sprint) and in a way that he won't be able to aim you(jump).