Why are there so many workouts that are almost the same?

I’m doing SSB LV II currently. If I look at the Thursday threshold workouts over the 6 weeks, the IF progression is as follows:

0.82
0.87
0.86
0.89
0.92
Rest week

So generally an upward trend of difficulty. Similar with the VO2max workouts.

So although the power profiles of the workouts vary where it’s not easy to compare them, the IF increases - so I know they are getting harder (I’m not looking forward to Lamarck!)

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