Easy Legs is a recently released iPhone app by Lolofit, a software company making fitness mobile applications. Easy Legs focuses on toning up your legs and butts with a quick 5-minute workout everyday. Or if you have 10 minutes extra, push yourself for a vigorous 15 minute workout; depending upon your fitness level.

The workouts are customized for beginner, intermediate and advanced exercises. There are 65 different exercises available in audio-visual format. It's interactive, easy and quick. Watch out for this app to have a personal trainer (though, virtual) for yourself: