Bicep curls? An isolation exercise working a single muscle the size of an orange?
“Bicep curls?”
Do heavy (for you) sets of 6 with a barbell.
You’ll feel it in places beyond biceps.
Bi= two. You can use a hammer bar to work your side biceps.
I don’t care so much about muscle hypertrophy at my age, but I don’t want my lower arm to keep waving when wearing short sleeves and I wave goodbye to people, then stop.