Erika knows the words "somersaults" and "cartwheels". A cartwheel is a long ways away, but she can do a rudimentary somersault. She lifts her butt up in the air and tumbles forward with a plop. In this 8 second movie -- WMV, ~ 967 KB, MPG, ~ 1.5 MB, she does it on a bouncy rubber mat in Inflatable Wonderland; and in this 38 second video -- AVI, ~ 18.5 KB, she does a somersault on a doormat in the living room. She succeeds once, and falls on her side on other attempts. Despite that she is proud of herself. "That was a big one!" she says.