Uncle Mort, go for it what it does to your core is amazing, I do it twice a week along with yoga and the diffrence in my core and flexability as amazing. I too though at first it wasn't doing anything, I'm a cardio junkie so if I don't feel my heart beating out my chest I don't see the point... however I gave it a few weeks andI could feel a massive diffrence in everything I did... was running faster and longer, kicking and punching harder... go for it and stick with it