We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Biceps are not major functional muscles. There are only three good reasons to strengthen biceps in isolation: arm-toning for middle-aged women, showing off in wife-beater Ts - and, usefully, to provide some complementary balance for the far more useful and important triceps.
However, fact is that most upper-body chest, core, back exercises, and full-body exercises and body-weight calisthenics like pull-ups and ropes activate biceps enough without needing to do very much of those muscle-isolating "curls for girls."
As BD has said, the Maggie's fitness philosophy for sedentary-working people is about overall fitness, muscle and cardiovascular endurance, athletic functionality, posture, core strength, and good body-weight management rather than body-building and body-sculpting. Maximally-functional for life, not for the gym, prison yard, or for the Gay Parade..
In my view, the more muscles an exercise stresses, the better. Besides intense interval cardio, what kills me but makes me fitter are pushing the full-body, mixed cardio+strength+core exercises like ball smashes, ropes, lunges with kettles, pull-ups, burners, and the like. You just do them until you break.
I'm now in my ahem middle sixties. I do sit ups everyday (it helps getting out of chairs, sofas, etc) push ups, all around good, and deep knee bends. I every other day do biceps with dumbbells for it helps picking things up and steadying your hands.