IPhone builder application, is pretty good because you can use various exercises, program set, and you had set the timers. I would recommend this application to anybody, eventhough it cost $20, covers free updates, and videos, all kinds of wonderful features. It's better than paying 20-30 dollars at the gym every month. So, I would highly recommend for you to look at this application. There is also a demo if you ever wanna try it out.