Rock drummers have to be in top physical condition.
Lars Ulrich of Metallica says a concert is similar to a marathon for the drummer.
You don’t step away from the kit for 3-5 years then think you can do a 2hr concert after a couple of 1hr rehearsals. That could very well result in a heart attack for a 67yr old man.
I saw Boston live two years ago in Cedar Rapids, Iowa, and remarked then how very demanding the drummer’s job was for that show.
RIP Sib. Great drummer.