SPEEDUP Motion Tracker is a coaching aid which merges information from two smartphones: 

• One smartphone, placed for example on the ground in front of the bowler, generates a 3D trajectory of the ball from which the speed, throw angle, and other parameters will be extracted.

• Another smartphone takes a slow motion video of the bowler.

The characteristics of the ball flight are valuable information that the coach can now take into account in his video analysis work.