What do you all do as a daily warm up, if anything, to improve your finger strength? I have found that after playing 5+ hours a day, I cant play accurately due to finger weakness. My fourth finger in particular is extremely weak, and even very easy passages become difficult as my finger slips. I have heard that hanon, which I previously did every day, is not as beneficial as some claim. I'm not sure which exercise it was, but it was performed as such- two hands thumb on C octaves apart- CEFGAGFE DFGABAGF. Up and down up and down. Is there a better exercise that I can use? I've heard that Chopin's etude op. 25 no. 11 works wonders, but I'm looking for something a bit easier and casual for now!
Any help with this is much appreciated.