Re: Concrete Ukemi
As an older practitioner, I have no intention of trying my rolls on concrete unless forced to do so. As a secondary point, I question whether anyone would have enough time to do a nice roll if they were tripped or had an incident where they went down quickly. I know some uchideshi at one school that go out back and perform tobu ukemi on the pavement. I also ran into some that at one seminar after imbibing too much in the spirits went outside the restaurant and took high falls on the cement. Young and foolish in my mind.