Professional players use this one all the time. "When in a gun fight or moving out of doorways and corners, making yourself hard to kill will always go a long way," says Wyatt, citing jumping while instantaneously shooting as a good way to avoid getting shot. "[It] can be wildly beneficial." Your aim will almost certainly suffer at first – you are, after all, jumping and shooting at the same time – but practice makes perfect. You'll win far more one-on-one engagements, which will make all the difference between hitting your Scorestreak or losing it. Just remember, this isn't 'Mario Bros.': Jumping repeatedly will not only make you look the fool, it'll also get you killed. Jump once, with vigilance, then try something else (it's all about variety).