I agree with M@L.
Running is a specialized sport that requires different movement from your body than exercises like Zumba. I would not use running shoes in a zumba class (too many moves side-to-side, which running shoes aren't designed to support) and I wouldn't use cross trainers or anything but running shoes while running.
For me, running is SO dependent on my shoes. Without properly fitted running shoes, fitted at a specialty store, I hurt too much to run. I suffer from shin splints, and improper shoes simply don't do the job, and I end up sidelined for weeks with severe pain.
I don't know that I would rely on an insole to "convert" your shoe into a running shoe. You don't use a screwdriver for a nail. ;) Get the right tool for the job!
Writer, mother, wife, and breadwinner. I love to run, but running doesn't love me, so I'm switching to my low-impact bike.
I'm not pregnant, just fat: My blog. fatnotpregnant.blogspot.com/
| current weight: 185.0