Shoutbox Workout Timer is a free online interval round timer for martial artists.  Shoutbox Workout Timer generates a new random heavy bag or shadow boxing workout every time you use it.  Click the help button below to learn more about using the timer.  You can also set the timer to "bells only" to use it to time your sparring and grappling rounds.  The "bells only" mode is also perfect for timing Circuit Training, Crossfit, Tabata or High-Intensity Interval Training (HIIT).  The "exercises only" mode will call out body weight calesthenics at random.  Perfect for working out when you're on the road.