So I am currently doing an internship at a rehab center in ohio and I have to do a project with one of the permanent education animals. My idea was to give the one small box turtle substrate that would make her have to use his back legs more often but at the same time wont be to hard for her to get around in. So I was just seeing if anyone would have any good ideas on potential substrate for a small box turtle and I mean small box turtle (I will provide a pic). I was currently thinking either repto bark or coconut shavings(looking for 3 options to try), but please give me other good ideas. And if anyone might have an cool enrichment ideas for her as well that would be much appreciated.