Victoria Stretches in Stilettos! Serena Does the Splits! 17 Celebrities With Stealth Fitness Moves

Last week, a mesmerizing bit of workout inspiration appeared on Instagram--of SZA, performing a double back handspring in her sun-drenched backyard. The singer's feel-good clip revealed a hidden talent--who knew SZA could flip?--and yen for an unorthodox workout that left us wondering who else among our favorite celebrities might be hiding a fun fitness secret. Well, there’s Serena Williams performing a split in mid-air, her legs stretched effortlessly through two gymnast's hoops--no doubt a t...