Serena Williams really knows how to promote her fashion line.
The 37-year-old tennis champ Williams posted a bouncy video Wednesday to her Instagram to promote her "S by Serena" fashion line.
The video starts off with Serena walking away from the camera in slow motion, really showing off the tennis star's bodacious booty. Wearing her python print jump suit she captioned the promo with, "The Yvonne Python Wide Leg Cropped Jumpsuit from our August collection just landed @Serena. Don’t miss out."