I think it helps to refer to them as "recovery days" rather than "rest days". It is part of a deliberate strategy to let your body catch up on all those little repair jobs, and to get stronger, not a case of laziness - and the wording should reflect that.
But it doesn't mean you have to necessarily sit on your butt. Keep it moderate in terms and intensity and duration, and avoid high impact or strength training. A 20 minute walk (for example) would fit the bill perfectly, and help you stay in a routine of regular exercise while still allowing sufficient recovery for your body.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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