Olympic gymnast McKayla Maroney is pantless and flipping so high and so fast, her 1.3 million Instagram followers can barely keep up. The 25-year-old vault queen, best known for her "unimpressed" face at the London 2012 Olympics, today made sure 100% of her audience was impressed, taking to social media with a rare revisit of her glittering career and its highest moment. McKayla was posting from the Olympic trials, and the video more than showed just why this sport is cut-throat. Check it out below.