There was a time when only scientists could watch what actually happens when we fall or hit a golf ball, a baseball, etc. It required sophisticated and expensive high speed cameras to film the event and then play it back at regular speed for extra slow motion. For example, this video of people falling from their skateboards is filmed at 500fps to 1000fps with a Redlake N3 high speed camera (which is priced around $30K).
However, if you are on a budget, you can get a high speed digicam (e.g. Casio Exilim EX-ZR100 [QuickPrice Check]) for a couple of hundred dollars ($299.99) and be your own sports coach (though the image size will be quite small at 224×64 pixels).