Two things come to mind right away. First is sitting in dresses and skirts. Keeping legs together or crossed requires he use of another set of ab muscles, I wasn't used to using. My tummy was sore for the first few days when I started out. Walking in heels was an adjustment but, I started out in 4-1/2" heels instead of something a bit lower. Starting in a lower heel would have been smarter but, I love they way my legs and butt look in them! : )
