Interesting studies questioning the need for recovery days. As with all studies, the conclusions are generic, based on limited data and may not fit you particular circumstances. Not sure if these have been talked about on here recently but have been away and not caught up on all the threads yet. https://www.ncbi.nlm.nih.gov/pubmed/27682004 https://www.frontiersin.org/articles/10.3389/fphys.2018.00725/full I think the main take-away point is that if you miss a workout, you can make it up and not have to permanently lose it. However, in this case, the actual benefit is probably more psychological than physiological.