I and my wife both have 50-53 bpm at rest, mine certain periods were 48 and doctor demanded to do an echocardiogram even after I explained I do a lot of sport. Everything was fine. Btw TLDR, we got those bpms doing crossfit 3&#x2F;4 times-week (4&#x2F;5 my wife), we rarely walk at all. I switched to crossfit recently (a few months), before I did powerlifting + cardio for years which provides very similar results from the POV of heart rate, AFAIK. Btw I think my level of cardio fitness is improving with CrossFit compared to PL.