“Sprint Intervals on Treadmill”

W:R Ratio

40sec:20sec at 10mph @ level 3.0 incline for 5 sets

30:30 at 11mph @ level 3.0 incline for 5 sets

20:40 at 12mph @ level 3.0 incline for 5 sets

Total: 15 sets inĀ 15 minutes