the gym workouts I do are 2 different total bodies(GBC style) that alternate 4 times a week.
I would like to have your opinion on which is the best method according to you and if you can suggest some source (book / site / seminar etc …) on the use of sprints for fat loss.
What does 90/100% mean? I don’t think it’s necessary or even a good idea to do multiple 200s all out. There’s a video of Carl Lewis doing multiple 200s in 28 seconds which would have been around 70% for him. He rested for 90 seconds in between. I believe he would then shorten the rest periods on subsequent workouts.