Functional footwear, shoes that claim to improve posture, strengthen leg and butt muscles and relieve back and knee pain, are all the rage this year, thanks to brands such as MBT, Earth and Fit-Flops. Now Skechers is getting into the arena with a line of shoes called Shape Ups. Famous Footwear is one of the only places to find these shoes, which retail for $99.99. Better yet, code MOM2009 takes an extra 20% off to drop the price to $79.99. With the discount, these are more than $100 less than other functional footwear brands. Shipping is $4.50 and sales tax is charged in states with Famous Footwear retail locations. Sizes are limited, so act fast!