Iron palm or iron hand training seems like it would work well against grapplers [though not in a competition setting]. Being that you are constantly striking downward on a bag filled with various objects, eventually developing enormous power in even short range strikes. Seems ideal for striking down on either a grapplers skull or back of his neck,while he is trying to shoot in for a takedown. Has this topic come up before? Again I guess it is hard to test this theory unless you used it for real, but unless you are trying to seriously injury the guy.It’s hard to test this theory out.