The thing is to find a number that you can maintain for the interval/set. That gives you something to build on as you get stronger as you can increase the number after every few sessions and see your improvement. Was 120 too high a number to start? Are 1min efforts what you need anyway? All of this is why I enjoy turbo training, the numbers, the numbersFound my old wired cadence sencer / computer fitted it and gave it a go. Did 10 minute warm up 1 minute cadence 120 then rest 1 minute did it 10 times all it the same gear. WOW that was hard work. After 3 sets I was finished. Did have to man up for the last 7. That felt good after I finish all 10 sets