Barefoot running and sand

Apparently cracks appearing in various parts of one's feet are common enough.  I do not have a callus remover. But I do have a lake shore with fairly coarse sand in places.  I have found that running through sand (only possible here when the lake level is not too high) helps in dealing with the problem.  Using moisturising cream to combat the drying effect of running on earth also helps - I use Silcocks Base.