I am always in search of wonderful and safe exercises that help us keep our lower extremities strong. This is a great exercise and a great addition to my original video on Single Leg Balancing. As we improve in our strength and stability, we need to find ways to make these exercises more and more challenging. It is easy to pick up these exercise bands (our office uses Theraband). Good luck.
http://www.amazon.com/Thera-Band-Light-Set-Resistance-Exercise/dp/B001EU9M1S/ref=sr_1_1?s=hpc&ie=UTF8&qid=1394342843&sr=1-1&keywords=theraband
http://youtu.be/mfTQIUWTMBo