Hyoyeon's formal dance training started in elementary school. At her neighborhood's small hip hop school, she learned hip hop, jazz, and latin dance. In 1999, she enrolled in Winner Dance School, a famous dance school in South Korea specializing in popping, locking, animation, and various other hip hop styles. At the school she met Miss A's Min, with whom she formed the dance team Little Winner. The duo preformed at various showcases and was spotlighted by HipHoper.com in 2004. She recieved dance instruction from teh Electric Boogaloos and top choreographers such as Kim Hye Rang, Poppin Seen, Kwang Hoo (aka Crazy Monkey), Poppin DS, Kwon Seok-Jin (aka Locking Khan) and Black Beat's Shim Jae Won. She also worked with one of Justin Timberlake's choreographers and a few foreign teachers. She was BoA's silhouette dancer during a performance at M.net KM Music Festival 2005. In 2007, she teamed up with Jae Won for a dance collaboration to "Anonymous".
On March 7, 2010 she played a cameo role on SBS Oh My Lady! starring Super Junior's Choi Siwon and Chae Rim with fellow members Jessica and Sooyoung. On October 17th, 2011 it was confirmed that Hyoyeon would be joining for the second season of Invincible Youth 2, a Korean reality show alongside fellow bandmate Sunny. On March 25, 2012 it was revealed that Hyoyeon would be making an appearance on 'Dancing with the Stars Season 2'. Hyoyeon joined the cast MBC's 'Dancing with the stars Seasons 2', which aired its first episode on April 27th of 2012.