A big caveat maybe that I’ve been making music for decades but only started playing drums a couple of months ago, so it’s not going to be very efficient drumming + I’m a programmer, so my fitness is already very low :D

I noticed the same a while back and looked it up, and some website says 1 hour of drumming is about equal to 10k steps in burned calories. I don’t know how accurate that is, but going by my sweat levels after 1 hour of drumming, I’m counting it.