 So, you really don't want to make two different skeletons for IK and FK. Not a problem. In the next 30 seconds, you will have both in one. Real quick, I got the idea for this from watching this video over here. So, shoutouts to Ega Passion for tankin' big. Alright, let's do this. Go to edit mode, click the shoulder, press E in middle click up, and name it 5K Shoulder. Click the hand IK, shift click the shoulder 5K, control P, and keep offset. You're done. Congratulations! Now, if you want to move the arm with normal FK, just rotate the shoulder 5K. Otherwise, you still have access to the normal IK that we all know and love. If you want, you can do the exact same thing to the leg, but that's up to you. Hope that helps. If you enjoyed this video, please don't forget to like, subscribe, and ring that bell. Hope you have a fantastic day, and I'll see you around.