Day 40 Interval Circuit

Helpful Brief: Twenty seconds on, forty seconds off, or 20/40s, are truly brutal, but they're a great way of getting fit and increasing power if you ... Starts with a 5 sec pre-count, then plays a five beep countdown before each round starts and a beep when it ends, plus an alarm ...

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Starts with a 5 sec pre-count, then plays a five beep countdown before each round starts and a beep when it ends, plus an alarm ... A fully challenging, full body dumbbell workout that will test your fitness level, strength and determination!

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Twenty seconds on, forty seconds off, or 20/40s, are truly brutal, but they're a great way of getting fit and increasing power if you ...

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Starts with a 5 sec pre-count, then plays a five beep countdown before each round starts and a beep when it ends, plus an alarm ...
A fully challenging, full body dumbbell workout that will test your fitness level, strength and determination!
Twenty seconds on, forty seconds off, or 20/40s, are truly brutal, but they're a great way of getting fit and increasing power if you ...

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