Seriously, if you want a workout-USE BOSU BALLS!!!! While they make the routine itself more difficult, it’s a good point to do this in order to increase stamina, core strength, and endurance. Adding these also helps increase your heart rate, TRUST ME. While I’ve moaned a groaned that a workout makes me sore and tired and all that afterwards, I still feel so much better and using the bosu balls really helps to make a difference in my workout. So if you’re looking into these DEFINITELY try one out.