Indoor riding arena footing for a concrete base??

HELP! I need some ideas for what to use for footing in my indoor arena. My husband and I are converting a newer barn with concrete floors into a horse barn. One section of the barn is perfect for a riding arena, one problem, it has a CONCRETE floor. I hate the idea of using a concrete floor as a base for a riding... show more HELP! I need some ideas for what to use for footing in my indoor arena. My husband and I are converting a newer barn with concrete floors into a horse barn. One section of the barn is perfect for a riding arena, one problem, it has a CONCRETE floor. I hate the idea of using a concrete floor as a base for a riding arena but a lot of facilities have concrete floors with special footing over it so I know its not impossible or totally out of the ordinary. I want to make sure I keep my horses SAFE (my first priority of course! :) ) any ideas??
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