Dance training differs depending on the dance form. There are university programs and schools associated with professional dance companies for specialised training in classical dance (wedding rings) and modern dance. There are also smaller, privately owned dance studios where students may train in a variety of dance forms including competitive dance forms (e.g. Latin dance, ballroom dance, etc.) as well as ethnic/traditional dance forms. Professional dancers at the Tropicana Club, Havana, Cuba, in 2008 Professional dancers are usually employed on contract or for particular performances/productions. The professional life of a dancer is generally one of constantly changing work situations wedding dresses, strong competition pressure and low pay. Professional dancers often need to supplement their income, either in dance related roles (e.g., dance teaching, dance sport coaches, yoga) or Pilates instruction to achieve financial stability. In the U.S. many professional dancers are members of unions such as the American Guild of Musical Artists wedding invitations, the Screen Actors Guild and Actors' Equity Association. The unions help determine working conditions and minimum salaries for their members.