CHIBA, Japan -- "Imagine the face of a person you hate!" Gasps, squeals and laughter ensued as visitors equipped with boxing gloves and head-mounted display goggles began swinging at a punching bag.

"Boxers don’t just punch a bag all day long ... and out of the fist." Knockout technique: Assume your boxing stance. Extend the arm on your lead side (fist clenched) directly in front of ...