Fitness apps seem to be a very rare species on the App Store with very few making the top 100 charts. That's probably because we're all becoming rather lazy nowadays, but that doesn't stop developer 'code a plus' to deliver quite a stunning app called Guerrilla Cardio ($1.99). The description boasts a scientifically-proven body fat loss training method that actually works, where you work out for just 4 minutes per day (yes, not a half-hour morning jog) to improve your fitness.
For iPhone users looking to mix their own music, software developer Amidio has released an app called Touch DJ [App Store, $19.99], which the company claims is the the first full-featured DJ application on the iPhone platform. The application offers realtime independent manipulation of two MP3 files, including scratching, looping, positioning, equalisation, effects and and pitching.