Punches - measuring power and speed

This is a professional app for measuring punches.
Get your punches' power, speed, and duration with real values and high accuracy.
Measure your reaction time.
Store all the punches.
Compare them with each other.
Track your progress.
Share punches.
How does it work?
To record a punch, grip iPhone tightly and punch. App records a punch motion at the inertial frame of reference using gyroscope and accelerometer data and saves the punch.
All information about a punch is revealed now.
Graph of speed and all the punch rates: acceleration, distance, power, duration, reaction time.
On speed graph you can see how your punch accelerates and swing as first peak if it exists.
You can record another punch to make a comparison, or you can share your punch.
You can choose appropriate units: kilograms or pounds, kilometers per hour or meters per second and etc.
You can record any kind of punch and not only the punch but any motion of your body.
Technical data:
On iPhone 4S application can’t work properly. Punch speed on iPhone 4S may be 2 times lower, but duration and reaction time are still correct. App works perfectly on iPhone 5, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6S Plus, iPhone SE. But it may be not that easy to grip iPhone 6 Plus or iPhone 6S Plus when you punch.
Speed measurement error is not more than 5% in most cases. Maximum acceleration is about 16g. Power is calculated approximately, with special formula based on your skills level, punch speed, and your mass. Put your mass in a punch to get more accurate result. Distance is calculated with small deviation when you punch the air. You get a straight distance between punch starting point and punch ending point. Time accuracy is limited to 10 ms.
Warning! Use this app only at your own risk! Make sure that you hold your iPhone strong enough and be careful when you punch! Developer disclaims any responsibility.