I have been using sports tracker for years. I first used it on the Nokia N95 8GB several years ago. This was an excellent app that allowed you to track your moves using the mobile phone as a GPS. The limitation of such an app was battery life on mobile phones. The battery usually did not last more than an hour at first and eventually progressed to two hours or more.
Today Amer Sports announced that it has bought Sports tracker. Sports Tracker is an application that I have been using since I had the Nokia N95 8GB. I used it on symbian, iOS and Android devices over the years. What I love about this app is the way it displays information about the work out. It gives you several screens while you are exercising with the option to select which information you want to see most.
The Apple Watch rather than fill a niche provides a fifth screen. According to Wikipedia the four first screens are the cinema screen, the television screen and the mobile phone and tablet screen. The fifth screen is the smart watch as designed by Apple, Samsung, Sony and others. Apple and others have designed phones that bring the mobile phone experience to the wrist. Energy efficient Suunto, Garmin, Fitbit and other brands fill the wrist worn niche effectively because they have designed devices with energy efficient displays that provide tracking whilst at the same time giving extended battery life.