For my sport activities I use a Polar RS300 and for keeping track of my activities I use SportsTracker. I don't own a interface to the computer so I need to add information manually into SportsTracker.. The problem I faced was that I could not add the time spend in the different zones. I wrote a small java program which is capable to add this info in a html file which SportsTracker understands. This was my first attempt to write something in Java..