I’m currently on Build phase of High Volume AT plan for Gran Fondo, and I have VO2 Float Sets, VO2 sustained intervals, Threshold and Sweet Spot work outs.
I really don’t like the Float Sets workouts, it’s not about its difficulty, I find them easier than the sustained efforts, but the ERG of my indoor trainer doesnt work well either my shifter (its a bike a use only for the trainer). So it’s pretty uncomfortable and tricky for me to do those fast pace changes, so I prefer the sustained intervals.
It’s ok to replace them? (for example a VO2 Float Set 5.1 PL replace it with a VO2 Sustained or traditional Interval 5.1 PL) or I miss any specific adaptations? Both of them target the same energy systems so I guess should be the same. I’m wrong?