Music is an important element of exercise – few people who go to the gym or just going running do so without donning a set of headphones – and DjRun is an app that can be used to ensure that the music you are listening to matching the speed at which you are working. If you are running at breakneck speed, it makes little sense to have slow music playing, and if you are on a slower stretch, fast tracks seem inappropriate.

The app works by first analysing the music in your collect to determine the tempo – this is a process that can be fairly lengthy, but once it has been completed DjRun will then be able to match music to your speed. This works by using data from your phone’s accelerometer and enables to run, row, skip and perform various other exercises in time with the music.

It would have been good if the app had been expanded slightly to include a step counter or even a distance record. Apps such as RunKeeper have shown that there is a great deal of interest in tools of this nature that can not only track details such as this but also use GPS data to track your routes on a map. That said, DjRun, despite its name, is a tool that can be used for many things other than running, so it could be argued that extra features such as these would not be entirely appropriate.

While the basic, ad-supported version of the app is available for free, there is also a paid-for Pro version that includes extra options. This includes the ability to override tempo detection and listen to your own playlist as well as an interesting option that will automatically change the playback rate of music according to your speed. The Pro version also makes use of an online database to change song tempos to help speed things up.