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this would all be not a problem is easy ans medium where based on hard level sets 

if your hard exercise imrpoved 1.5% your easy and medium also goes up 1.5% make medium and easy completely autoregulated based on hard level sets, no guessing what rir you're at (which we know people suck at) and no eaqy and medium level exercies that advance way to far/fast.

my medium exercises always make to much of a jump so does easy.

we have an app that autoregulates nearly everything but it completely lost the ball at medium and easy exercises imo.