(FILES) — This file picture taken on June 14, 2014 shows New Zealand’s All Blacks performing the haka during the second rugby union test match against England in Dunedin. New Zealand’s pre-match haka may be one of sports most famous rituals and often claimed to intimidate opposing sides, but now its benefits to the All Blacks are being questioned. Their reputation for being slow starters from the kick off has led to suggestions they are emotionally drained from performing the iconic haka, a traditional war dance once performed by the indigenous Maori before battle. AFP PHOTO / MARTY MELVILLEMarty Melville/AFP/Getty Images