** Xponential Fitness XPOF.N shares rise 4.6% to $7.06 pre-market
** Boutique fitness franchiser said late Monday it initiated a strategic review that may include a sale or merger
** Review comes less than a week after shareholder Kanen Wealth Management sought it, citing "structural instability" at XPOF
** Kanen Wealth Management owns around 4% stake in XPOF
** Analysts rate XPOF "hold" on average, while larger competitor Planet Fitness PLNT.N is rated "buy" - data compiled by LSEG
** Up to Monday's close, XPOF shares were down ~18% YTD
(Reporting by Nandan Mandayam in Bengaluru)
((Nandan.Mandayam@thomsonreuters.com; Mobile: +91 9591011727;))