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30 x (60 seconds - 30 seconds) intervals by Interval Timer: Custom Workout
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Interval timer - 45 sec rounds / 15 sec rests (including links to 14 workout routines)
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Interval timer - 40 sec rounds / 20 sec rests (including links to 19 workout routines)
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Best Interval Timer Apps: iPhone & Android (Which App is Best for Interval Timing?)
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Interval Timer With Music | 40 sec rounds 20 sec rest | Mix 101
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30 / 10 Second HIIT Interval Timer
