For sure Build can be crushing compared to SSB. I’ve tried to get as much volume as possible during SSB to prep for build, as my last build phase (only done one as I’m a bit of a cycling newb) destroyed me. Threshold sucks for me just now. Not only because it’s tough, but my gearing whilst on the dumb trainer means, I’m either at 98rpm, or I change up a gear and sit at 82rpm. Neither are a natural cadence for me 
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