Workouts for Women Challenge Your Core Love side planks? This twist on the popular move will strengthen your abs, improve your balance and leave you feeling strong. May 4, 2013 The Oxygen Team Share this Facebook Icon Twitter Icon Email Icon Join Oxygen Mag Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Join Oxygen Mag Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In