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Gymboss Interval Timer Get your FIERCE4 TKO Tabata on!!!!! The GYMBOSS is a small, easy to use, repeating interval timer. This multi-use timer has many versatile functions that make it beneficial to your FIERCE4 TKO Tabata workouts! Use any music for your FIERCE4 TKO TABATA workout and use the GYMBOSS Timer it's that easy!