Alright guys, I've been working on my grip strength for application purposes (making startling progress btw, noob gains FTW), and I started looking into various other striking surfaces than the main ones on the fists and open hand, such as the tip of and the second knuckle of the thumb like in Uechi-ryu. Being young and full of vinegar, I've been happily bashing said surfaces into things harder than them and hoping for the best. I've developed a little callus on some of the surfaces, but I've noticed that I still have a lot of play in the joints. Since those are likely going to be the first part to fail, any ideas as to how I could strengthen them? I'm sure strengthening the muscles in the forearms would play a large part, since they control grip, but there seems to be a disproportionate amount of weakness. I've started fingertip pushups, and I understand time + effort is a strong factor. What do you guys think?