ORIGINAL: MrMike
The flying site (Chatfield State Park near Denver) is a mile high - the laws of physics come to play big time: The air is thin and lots of speed is needed to generate lift. It gets even more of a challenge on a hot summer day - the video was shot in March. The F-4 is a draggy jet under the best of conditions.
On a jet the approach is supposed to be with the nose very slightly upwards...if its pointing very severely downward you are too fast. (Or you have passed the point of becoming too slow. In that case start start looking for the extinguisher...)