Johnny is having a groovy roller disco flashback. Watch his hips work it as he twists and turns on his path to a groovier dimension. A servo motor shifts his upper body and hips back and forth altering his balance allowing him to turn like a real roller skater. The hip/upper body motion moves his arms up and down. Two l-motors propel him with tank steering for additional agility. These functions are programmed as sequences to an SBrick.