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Stairmaster HIIT challenge

Advance

20 minutes

30 seconds HARD, rest 30 seconds EASY,
60 seconds HARD, rest 60 seconds EASY,
90 seconds HARD, rest 90 seconds EASY,
90 seconds HARD, rest 90 seconds EASY,
60 seconds HARD, rest 60 seconds EASY,
30 seconds HARD, rest 30 seconds EASY.

Workout overview:

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