Shot Tracer 3.5 brings a lot of app improvements but also a new feature called Fire Swing Tracer. Turn your swing into a fire like swing motion this this amazing new app feature! How to create a Fire Swing Tracer:

Simply select or record a video in the Shot Tracer app using the Swing Tracer feature. Once a video is selected it will prompt you to shot impact frame setter screen. The shot impact is auto set (if not set correctly, use the slider to set impact) Press save and video is exported to iPhone video gallery.