Treadmill HIIT:
Warm-up 5 minutes: 3.5-4mph
Circuit:
Run 2 minutes: 5.5-6.5mph
Sprint 1 minute: 7-9mph
Repeat 8 times*
Cool down 5 minutes: 3.5-4mph
Treadmill HIIT:
Warm-up 5 minutes: 3.5-4mph
Circuit:
Run 2 minutes: 5.5-6.5mph
Sprint 1 minute: 7-9mph
Repeat 8 times*
Cool down 5 minutes: 3.5-4mph
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