The widget tracks your current rung on the Introductory or Lifetime Ladders, how many times you have completed the exercises for each rung, and displays a count of the number of repetitions for each exercise at that rung. By hovering over the name of an exercise, you can get a brief description of the exercise.
The widget supports cross-mac Dashboard Sync via .Mac (subscription required), so you can keep track of your workout both on your desktop, on your laptop on the go, etc.
With the simplicity of 5BX and having the information always at your fingertips, you'll always be ready for a quick workout. No excuses!