As you jump to grab on to a ledge you obviously press 4, but before you press up hold down 7 at the same time 2 do a alternate pull up.
if you are jumping from a high place into a pool of a river press 5 and 7 at the same time to dive. (doing this on concrete from a high place will kill you.)
Karate Kid Lara
Follow the steps below to make Lara perform a Karate Kid pose.
Stand directly in front the fireplace at the Lara's home.
Press: 5 + Up + 4. Hold 4, but release in mid-jump as you come down.
Laura will do the famous Karate Kid pose with her arms stretched out, standing on one foot.