Try the v-sit rotation using a foam roller. Start the exercise by sitting on the floor with your legs stretched out on each side. Keep your back straight, your abs tight and your shoulders back. Hold the roller up, parallel to the ground. Keep your arms straight out in front of you. Rotate to the right and then come back to the center. Then rotate to the left. Repeat this pattern for 2 sets of 12 repetitions (6 on each side).
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