One of the first things most of us cancel during tough times is a health club membership. If you’re one of those people but still want to keep in shape, you have lots of alternatives. A couple of years ago, I interviewed NY-based Austrian fitness expert Stefan Aschan for an article I was working on and he’s been a great source of fitness and nutrition tips ever since. I asked him to share some of his tips for working out when money’s tight. And later this week I’ll be posting another article on inexpensive ways to keep in shape. Do check with your doctor before you try any new exercise…