Re: Mats question - sprung floor necessary on concrete?
Our judo dojo in the vancouver YMCA in the 70s had tatami on plywood, on top of used car tires. When I trained at UBC with tatami on concrete, the ukemi there hurt. A lot.
Kawahara (Aikikai shihan in Canada) usually says that the mats at most dojo are too soft and we should be able to do our ukemi outside on the street. (yes, but.... )
Walter
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