There is a long time member of the forum who has dealt with the bass and bodybuilding at the same time. I don’t want to speak for him, but perhaps he will chime in when he sees this.
Not that you could tell it to look at me, but I’ve also been involved in weight trining for 30 years. These days it’s mostly core training (Total Gym, pushups, medicine ball stretches, dumbbell presses, etc), and that doesn’t hurt technique at all; Like @Bijoux , I think it actually helps for the reasons he stated above.
There was a time about 20 years ago when I was lifting to gain size and strength where I found arm exercises like curls and anything specifically involving forearms and gripping would make my hands feel stiff afterward. I stopped doing that once I figured that out.
As we age as bass players, I think it’s a good idea to keep our cores strong and flexible, and to keep the ends of our limbs supple and flexible.