Bus Balancing

I don't own a Wii. I don't own the Wii-Fit program, balance board, tennis racquet or heart monitors to go with it. I DO commute daily on the bus, where I can practice stabilizing my core by not holding onto any rails (easy to do on a crowded bus where the hand rail is up way high) and fighting to maintain my balance against the inertia and/or obese children around me. For more of a challenge, I throw on a backpack complete with a large fluid filled Nalgene bottle to throw off the distribution of the weight. Seriously, it's a great exercise.