The CorePower Workout featuring Serena Williams is now available on the Nike Training Club App. The CorePower Workout features the 31-year old Tennis phenom walking you through various exercises involving resistance bands and a stability ball. Serena understands it’s hard for some to make it to the gym every day, so this App is made not to replace your gym regimen, but provide a great substitute. The Nike Training Club app is available now, so click here to learn more from Nike and download the application. You can also shop Serena's look on the app as well.