People have been taking portable music players on runs since they were invented, but Apple and Nike are now taking the concept of working out to your favourite tunes to the next level.
Now, you can turn your iPod nano into a training companion that not only plays back music, but tells you the distance you've covered and how much further you have to go.
You also have the option of selecting that one song, dubbed 'PowerSong', that will motivate you in the last stretch of the course.
The system is called the Nike+iPod Sport Kit and consists of a sensor that you place under the insole of your left shoe and a wireless receiver that you plug into your iPod nano.
More importantly, the set up is designed to hook up to iTunes on your computer and through that, to the internet and a service on Nike's website.
Once set up, the sensitive accelerometer in the shoe senses the activity you've completed, and tells the iPod nano, which then uses voice prompts to tell you the information, all the while pumping out tunes to fuel your workout or run.
The system will only work on Nike shoes, and only new Nike+ models (first model available in July). It allows you to download music repertoires from Nike's site, called Sport iMixs, which are 'professionally' selected soundtracks for working out.