One thing I learned at the gym: ponytails don’t work as video game animators think they do.

Press F at just the right moment to avoid gruesome death

Press F at the right moment to avoid gruesome death

In video games, ponytails like Lara’s mostly bounce up and down. Playing games before, it looked all right to me. (You can get an idea of how Lara’s hair behaves from this video. It may not be immediately obvious, as her hair is also affected by the wind, and movements of her head.)

Actual ponytails move left to right. The range of motion is surprisingly high– if the ponytail isn’t too big, it’ll go through more than 180 degrees while its owner runs. (You can see this in this video.) A thicker or longer ponytail won’t move as much, but the motion is still left/right. Not surprisingly, it follows the motions of the arms. (If the woman is walking, there’s much less movement, but what there is remains left/right.)

Not a big deal, but a fun physics fact.