How to Get a Flat Stomach for Teenage Girls

How to Get a Flat Stomach for Teenage Girls. HIIT Core Workout Workout breakdown: 50 sec work, 10 seconds rest; 13 rounds 1)Prisoner squat 2)10 High knees, 10 Mountain climbers 3)2 Plank hops, 2 Reptiles 3)Walk into plank, 2 commando pushups 5)Pike abs 6)5 star abs, 5 Jacks 7)Knee in abs 8)Oblique burpee, 5 jacks 9)Superman Abs 10)Jog with arm reaches 11)Side plank toe touches (right) 12)Touchdowns 13)Side plank toe touches (left)