Punch Power is an app for the iPhone and iPod Touch that uses the accelerometer to provide you with information related to you punch. That's right, with this app you grip your iPhone and punch in the air repeatedly until it records everything properly.
When you load up the app, the only button for you to press is Punch Now! After you do that, press the start button and punch until the app stops vibrating. After that you can look at your traumatized device and see your speed in miles per hour and distance in inches. The app will also tell you the number of punches per second you managed to accomplish.
If you're happy with your results you can press the record button.
If you do this multiple times you can actually load up the history tab and track your results. Before you start tracking your results to get an idea of your improvement, make sure you head over to the settings part of the app to configure the measurements to match yours.
This app is definitely interesting but the idea of punching with your iPhone doesn't sound like anything but reckless. If you need to actually measure statistics related to your punch, chances are an iPhone app isn't going to be accurate enough. This is probably an app that you should avoid unless you really enjoy punching the air with your iPhone.