Reddit reviews The Ultimate Guide to Weight Training for Fencing

You should talk to your coach about any conditioning work and my coach use to send us to an athletic trainer that knew what areas we needed to focus on for fencing and can determine where you need to concentrate on and give you a guide you in the right path.

There are some things your coach might not want you to work on building muscle on, my coach didn't want me to work on my arms as much because I had a heavy arm (not that he didn't want me to do workouts for it, he just didn't want me to build more muscle that would make my arm heavier). Same thing with my quads/hamstring they were huge so he wanted me to build more of my lower legs instead.

When I trained by myself I use to focus on lower body for explosiveness with footwork, hand strengthening to help prevent cramping, and core muscles for helping with form for building and other than that my conditioning was mostly concentrating on explosiveness and stamina.

I think there is a book out written by an athletic trainer that recommends workout regimens for fencers, I can't tell you if it is any good or not.

edit: here it is, it seems to not be very good and more of a general weight training introduction. maybe some coaches/fencers on here can comment on it.