Pashak did you get a dummy? I would like to know if it was beneficial. I do Judo, and have always thought of getting/making a dummy but have not. I think it would help throws, submission, and what not. What i do (because I cheap) is take my heavy bag and take resistance bands, the kind you buy at walmart and put them through the top (where you would normally hang the bag). With this I work on throws and can kind of work on being on the bottom.