Like everyone else, I too had itreadmill not working after upgrading to ios6. I tried restoring from backup, restoring to factory settings, then restoring from backup to get all my apps back. neither of these worked. Then i deleted the app from ipod touch screen and through itunes click on ipod through devices, once there at top middle of itunes window click on Apps. From there scroll down to itreadmill app in lineup and check it with a check mark. Then you must sync and for me it was working once again but this time working with ios6. I did lose all my past data but I can make new data with it woking once again.
tyme46myller about iTreadmill Pedometer, v4.0.4