Mahiro here is practicing the Kankudai (or Kanku Dai depending on which hastily-Googled page you're looking at), one of the more advanced routines in Karate.
Japanese pro wrestling champ Kazuchika Okada made this entrance into the ring, effectively putting all other wrestlers to shame. We're only sad that Okada didn't go Final Fantasy on his opponent and take that sword into the ring.
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