I teach group fitness, so have worn oodles of sneakers over the years.  I have high arches and wear orthodics, but let me tell you - this shoe is amazing!  The cushion and support in this shoe feel great.  Now "toning your butt" - I doubt it, but this shoe is definitely worth trying.  I don't think you'll be disappointed.  Runs very true to size if not a little on the big side.