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The Fartlek App is a training buddy in your pocket. Just go out for a run and let the Fartlek App decide when it's time to speed up and slow down – based om the length and intensy of your choice. What pace is fast or slow is up to you.THE WORD "FARTLEK"Fartlek, which means "speed play" in Swedish, is a training method that blends continuous training with interval training. Fartlek runs are a very simple form of a long distance run. Fartlek training “is simply defined as periods of fast running intermixed with periods of slower running.APPLE WATCHFartlek works with Apple Watch, allowing you to go out for a Fartlek Run without your phone if you feel like it. To learn more, go to the Apple Watch tab in settings.Legal Disclaimer:This mobile application and any information given by it or by App&Run are for playful purposes only. It is not intended nor implied to be a substitute for professional medical or training advice. You should always consult your health care provider before beginning any fitness program or participate in any training related exercises. App&Run is not responsible or liable for any injuries or damages you may sustain as a result from your use of, or inability to use, the features in this mobile application.