The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Vegard Gamnes:
Magic Step is a simple and modern step counter for your iPhone 5S. This app magically counts your every step throughout the day, month and year, even if the application is not running or open at all. Every time you open Magic Step you will instantly know how far you have walked and how many calories you have burned. Just remember your phone, Magic Step does the rest!And maybe the best of all, its free.-Meters and calories are calculated from the average Joe's perspective. The application works only on the new iPhone 5S.