it works dont listen to other people because they usually think hitting hard and a lot every day is gonna make bone growth thats not how it works but ive tested it myself and if you know what your doing the swelling alone gives you instant results with bonesmashing so what i recommend is to bonesmash not hard in like the bone you want to become bigger then when the swelling goes down do it again so not only will you be able to fraud having bigger bones with the swelling over time it becomes permanent thats what i did and it worked but make sure to use your fists not a hammer and brace your head