(HawaiiNewsNow) - We're at the site of where this viral video was actually filmed. This is 4-year-old Rachel Cheung and she's playing badminton while hula hooping. Her dad says they didn't know they were filming, just something she likes to do for fun. Isn't that amazing? That second video about to come up shows the force of just how fast this racket sport is as a badminton birdie pierces a watermelon.