Sexy Serena will release her training app this Friday March 15, 2013. It’s called CorePower for the Nike Training Club. Doesn’t she look amazing?
SERENA IS A MUTHAFUCKIN BOSS.
train like an olympian | do each exercise intensely for 30 seconds. move onto each move with little or no recovery time in between. once you’ve completed all the moves (4 minutes total) take a 60-90 second break and repeat set 2 to 3 more times.