>>272777506
Inverse Kinematics - how your character has elbows despite no tracking points being on them.
Boneworks has IK full body, VRChat has IK fullbody with extra option to have more trackers on it so you can also move your legs in-game when you move them IRL.
Floaty hands are the easy way out because they don't need to do the tricky programming to make convincing arm IK.