Your trainer:Bernie Zurella, a former World Kickboxing Association fighter and Army drill sergeant.
Now you get the exclusive.You’ll need:A stability ball.
Your plan:Combine these moves with thisstability ball butt workoutfor one awesome workout three times a week.
© Condé Nast
#sizemattersStandard balls are 55, 65 and 75 centimeters.
If your thighs are parallel to the floor, you’ve found your perfect fit.
Side Sculptor
Works: obliques, inner thighs
Lie faceup with ball between feet.
Roll onto right hip and elbow, left hand flat on floor behind you.
Squeeze ball and lift legs as high as you’ve got the option to (as shown).
Hold for 1 count; return to start for 1 rep. Do 12 reps; switch sides.
Engage abs and slowly roll up to touch fingertips to toes (as shown).
Bring right knee toward chest (as shown); return to start.
Lift left shoulder and crunch right knee to left elbow (as shown).
Crunch up as you pull an imaginary rope with right arm (as shown), then left arm.
Continue until you’re sitting.
Reverse movement to return to start for 1 rep. Do 12 reps.
