I tried with mirror tool and Symmetry object but it did not work as I want.
Then I find this but I can t see the answers. Maybe because I am not signed on.
Here is an example.:
I want to make this rig stronger by muscle with FFD. As you see it is difficult to create a similar FFD for the other leg (without any tool).
But if I mirror it the thigh and the ankle part is twitching.

