The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Spark HD:
10 and 20 Minute Qi Gong Focus Work Outs for the busy person. App also has a variety of learning tools and a journal feature to track your progress.This Lite Version Includes 10 Minute Video ONLY.***App may not work with iPhone 3G model (model before iPhone 3GS).*** Features: Air-Play Enabled. Use Air-Play with your Apple TV to stream high-quality video instruction to your big-screen TV while you work out. Top-Quality Videos. Videos are displayed in highest quality possible for iPad and iPhone. See crystal clear video while you follow clear and easy instruction. Journal to Track Progress. Use the built in quick journal to jot down your workouts quickly. It will keep track of the dates for you and allow you to look back over your progress. Pose Gallery (photo-by-photo). Use the pose gallery when watching the instruction videos to switch to a still, photo-by-photo display of each pose. Tap on the pose to get information about it. Email the instructions to yourself or a friend. Then return to the video in the same spot you left off to continue your workout.