I'm a professional pianist (female in my twenties) trying to get started with weight lifting, but I'm worried about the effect it might have on my hands in the long term. I'm mainly interested in building strength, not size, because I'm so weak from never having done any sport before that it interferes with my playing (I get tired much easier than I should, especially my shoulders). But when I started this week in a gym, where even lifting the bar without additional weight is a challenge for me, I noticed that my fingers get kind of "stiff" and lose a bit of dexterity if I try to play again after coming back from the gym. I tried to find information online about whether it's possible or not for a pianist to do weight lifting, or if I will end up ruining my hands, but I couldn't find anything consistent.
Does any of you know from experience? For those who lift a lot of weight, have your hands lost dexterity, and have your fingers become thicker with time?