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 Neil Kelly:
High-intensity training (HIT) is well-recognized as one of the most effective methods of strength training. Its core principle is a single weight set performed to failure. HIT Log Pro assists your training by allowing you to enter your exercises and the weight used in each exercise (either lbs or kg), combined with a method to measure the time under load (also known as time to failure) to track your progress.A built-in timer is provided with a large dual-use button to start and stop the timer, and a display to indicate elapsed time. Touching the button provides a 5 second countdown, followed by a beep to indicate that the set should start. Touching the button again when the set is complete (muscle failure) stops the timer and, if desired, the number of complete reps may also be added.The main page will display, for each exercise: the exercise name, the weight last used, and either the time under load, the number of reps, or both, providing a record of the key statistics for your last workout. Notes may also be added for each workout - to record your weight and measurements, for example. The second tab provides a record of all your workout sessions, organized by date and time. The third tab provides a graphical representation of the progress you are making in each exercise by plotting total energy expended as function of workout date.