Some folks, when first starting out with PGFO, experience some excessive gas.
I ran across this tidbit, that might help:
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From "Healthy Living" web site:
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Are you bothered by excessive gas? Practicing yoga may help. Yoga is known for its fitness and relaxation benefits. And just the right twists and turns may also improve digestive health and relieve uncomfortable intestinal gas and bloating.
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"Yoga is one of those practices that has a multitude of physical, spiritual, mental, and emotional benefits," says Lisa Korchma, co-owner of Yogawood, LLC in Collingswood, N.J. "Yoga targets areas within the physical body and works toward strengthening muscles, calming the central nervous system, and increasing and improving blood flow and oxygenation to the organs.”