When High Jumping is not hard enough for you. Found this a few month ago but never really tried it in an actual run. The first trick you see in the video is a Double High Jump. After buying the Double Jump pack make a normal jump and then perform a high jump as the second jump. The spot you see in the video is the only one where the trick is useful.
The second trick is an Double High Jump followed by an falling jump(when you fall from an cliff you have a few frames to perform a jump).