Andrea Metcalf demonstrates the V-twist.

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V-Twist—Step 2
Bend your arms to your chest; rotate and twist. Extend back to starting position and perform on the other side. Lower your feet and sit tall. Repeat this for 15 to 20 repetitions. If it's too hard for you, keep your feet on the floor for the entire exercise.
As a reminder, always consult your doctor for medical advice and treatment before starting any program.