Lot of good info here, but I think you hit the nail on the head when you said (above) "and not as strenuously." There is no need EVER to play the bass strenuously. I'm 77 and principal of a ten-member community orchestra section. We have a range of levels (including a couple of people who play MUCH better than I do but don't want the responsibilities). And we are a remarkably ego free bunch (we rotate seating), and we play fairly challenging works (Beethoven 9, Shostakovitch 5, Dvorak 9 etc).
I've had 5 vertebrae in my neck replaced with pins 10 years ago (and have both arthritis and tendonitis in both hands), so I gave up "strenuous" ages ago for re-learning how to play the bass EFFICIENTLY: how I sit, position of the bass, shoulders, elbows; my bow hand, left hand -- if anything gets "strenuous" it means I've fallen back into bad habits.
And I get my colleagues in the section to look at things like: are the squeezing/pinching their bow hold, or locking their wrists; do their shoulders go up and get tight; do they stop "breathing" when they play etc (Alexander technique is great for this; see attached). I play on gut strings and try and get everyone to use low tension strings and keep the height down. If I (or some of the others) can't make a presto run of 16ths, playing every other not in a community orchestra isn't going to kill anyone for a couple of bars. It's not that I'm telling them what to do, it's that I don't want to see them hurt themselves (or in a couple of cases, continue to hurt themselves).
Michael Klinghoffer has a series and book called "Mr. Karr teach me to drive the double bass" in which he says (more or less) that playing the bass is either easy or impossible. It took me 60+ years to understand what he meant. Stay in the orchestra, be chill (as the kids say) and have fun!