What must be done

Duration 42:00 TSS 42 IF 0.78

01:00 @ 40%

01:00 @ 49%

01:00 @ 55%

01:00 @ 61%

01:00 @ 70%

01:00 @ 50%

05:00 @ 71%

04:00 @ 82%

03:00 @ 95%

01:00 @ 109%

03:00 @ 50%

01:00 @ 109%

03:00 @ 95%

04:00 @ 82%

05:00 @ 71%

01:00 @ 75%

01:00 @ 68%

01:00 @ 63%

01:00 @ 59%

01:00 @ 54%

01:00 @ 49%

01:00 @ 42%

Stepped intervals require you to progress your way through the various Zones. The duration of each interval is decreased as the intensity increases.