** Shares of boutique fitness franchiser Xponential Fitness XPOF.N down as much as 21.2% at $7.75 in early trading
** Co announces CEO Mark King to retire due to health reasons
** Says King will continue to serve as CEO while co searches for his successor
** King was appointed in his role in June last year and had previously served as CEO of Yum Brands-owned YUM.N Taco Bell
** Including session's moves, stock has fallen ~40% YTD
(Reporting by Neil J Kanatt in Bengaluru)
((Neil.JKanatt@thomsonreuters.com;))