ive been manually animating the second half of symmetrical bones animations (like running or climbing ladders), and if there isnt a better method i'll laugh because no game goes without a running animation and this is a setup for making games.

if med doesnt have such a tool could i import my half-animated model into another program which does, or something? or is there any way better than manually copying each bone angle because that worked for a while but my animations are getting too complicated for it. also it's ethically grotesque

any help very much appreciated.