I used to do wing chun and workout on a mok yan jong (wooden man post) that I built myself, which I originally only built to toughen up my knuckles and hands and for Wing Chun. However I discovered these many benefits from the wooden man dummy:
Toughens my arms, elbows, hands and especially knuckles from striking it.
Toughens the bottom of my hands and sides as well as inner arms from using the muk yan jong for high speed blocks against the PVC pipe arms as when im throwing strikes against the wooden body.
My hand and arm speed is improving in my boxing and muay thai strikes from the time I spend working the wing chun dummy.
Its great for training alone, even indoors in bad weather or when you dont have a partner (if you have space).
Dont get me wrong I do boxing and muay thai for MMA standup technique and not wing chun at all anymore, but I still find the wooden man post an amazing training aid and conditioning tool for any martial artist or MMA enthusiast. And after the last year training with the muk yan jong I can hit any hard surface with my hands full on and not feel pain unless I hit it wrong. You hit a baseball bat or a tree bare handed without conditoning and you will prolly break something in your hand but after about 3 months of mok yan jong work its alot less pain, and after 6 months you dont have to hold back at all.
The only downside is my knuckles do tend to hurt when the weather changes and I get dry skin from the calluses which itch sometimes but those are minor problems well offset by the benefits imo.
I will upload a vid of me training on the wooden man post in a sec so you got an idea of what im talking about.
Heres the vid I was talking about, it doesnt look like it hurts but im hitting that tree dead on and hard, and that was only after about 3 months training. This video is about 8 months+ old and im better conditioned now, but it gives you an idea of the hand conditioning you can achieve.}