For, like, a paddock paradise/dry lot area - for the horses to aimlessly meander when not out in the grass pasture or in the shelter. We used to use pea gravel/millings with sand (so, sandstone ???) for the paddock track/dry lot, and the horses' (barefoot!) hooves were rock-crunching hard, but I was wondering if that really is the best?Are we talking arena footing, round pen footing, dry lot footing or? And best in what aspect - suitability for high-impact riding, ability to self-trim hooves, traction?