Trike riding, bottom-shuffling and brotherly love

We recently purchased Elias a little plastic trike (good for riding indoors too). He is still learning how to ride it but appears to enjoy his time on it. At first he would only go backwards (and very fast), however in the last couple of days he has started going forwards. Here is a link to a clip of him riding: http://youtu.be/bB7IrWBOyk0. This is a link to a clip of Elias bottom-shuffling: http://youtu.be/WhrRtuBTLmI