Just as an aside, after watching a recent TV screening of "Lara Croft" and watching Angelina doing inverted flips, cartwheels, and jumps, all the while blasting the bad guys with twin Glocks, I mentioned to my friend, "Yeah...I find this completely believable!" He replied, "Yes, everything except the breasts!" LOL!
Wow, those knees look like something in a science lab ... "See how the tendons connect? Note the curvature of the shinbone ... and the kneecaps!"