Boksklok Rumble Interval Workout TimerMet deze Rumble interval trainer kunt u de tijd instellen van: 15, 30, 45 en 60 seconden. Ook de ruststand is in 15, 30, 45 en 60 seconden in te stellen. De totale workout is variabel van 2, 3 of 4 minuten in te stellen.
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