I have arms like that, just with a bit more fat on them and I think actually a bit more muscle. Basic day-to-day living is all it takes me both to obtain and maintain - i.e. laziness means I hate taking multiple trips so I carry all my groceries in from the car at once, that kind of thing (which I guess is technically weightlifting). Grocery shopping with a basket, not a cart, and realizing halfway through shopping that I should have taken a cart because this is crazy heavy but oh well, too late now. Constantly holding a fatass heavy cat who adores being snuggled while I'm standing. Doing home improvement stuff myself, using heavy heavy All-Clad cookware, rarely if ever accepting anyone's help to carry heavy things for me. Haven't done arm workouts in literally years. Wish the muscle would shrink more, to be honest. The fit look is really not my thing.I am obsessed with her arms. They're so toned/muscular but still so skinny. I wonder if she works them or if it is mostly just genetics + low bf.