Not very often. I do hammer curls but I don’t go quite as heavy, and the few times I have I hang the weights off a karate belt and hold the belt in my hand so it’s not attacking my riser (bc my riser can’t handle a 70+ lbs dumbbell in a hammer curl position).
85 for 4 reps is crazy, you sure you ain't on something? lol, j/k. At my peak 2020 before covid, I managed to hold 100 lbs side pressure, now I tried the same hold and I couldn't even hold more than 75 lbs. That same bicep curl, now I could only mustard 70 lbs max. Bet you can do 100 lbs for 1 rep.
70 still isn’t bad for a 70kg guy that’s just getting back into it! And yeah I probably could! I don’t like doing one rep max’s though. They are a good way to get hurt - and if you don’t get hurt, they take some time to recover from. Jmo