I was just reading on your site about how bad concrete floors are to exercise on. Well, I live in Ethiopia and ALL floors are concrete. At home I have a concrete floor with hardwood on top. At school I have a concrete floor with linoleum tile on top. I have put a thin carpet on top of that, but other than that, there isn't much I can do. Given the situation, what other recommendations would you make? I love step exercise and usually work out 5 or 6 days/week.