ADDITIONAL MOVES FOR LARA:

Ledge jump up: Press Alt (Jump) to jump up, then Ctrl to Grab.
Ledge Hang Back flip: Hold Ctrl (Action) + Press Down arrow.
Ledge Hang Back Flip + Twist: Hold Ctrl (Action) + Press Up and Down arrow (or End (Roll) Arrow).
Roll out of Ledge Crawlspace: At edge of ledge Alt (Jump) + Forward arrow.