"Physical exercise in nature liberates your mind and body, and improves immunity. It increases the circulation of blood in the body, stimulates the dynamic release of hormones, and strengthen bones and muscles. When you exercise enough, you stop worrying about little things and lose the fear of childbirth. If you lead a nature-based life as normal living things do, everything goes well. Humans are designed to operate like this. Physical exercise has a positive effect on the fetus, too. If the mother is a couch potato and eats snacks all the time, the baby also grows lazy in the absence of stimuli. When a big stimulus like a contraction begins, the baby gets exhausted easily. But if the mother is physically active, the baby is jolted and stimulated all the time. Appropriate stress helps the baby to increase its vitality."
- Dr Tadashi Yoshimura, a Japanese obstetrician & natural birth advocate (Joyous Childbirth Changes The World)
"Physical preparation is a very important facet of preparing for instinctive birth, helping us to open to the 'specified reactions' of our instincts though, for example, different postures and positions. For example, Janet Balaskas's Active Birth exercises, optimal fetal positioning, The Pink Kit, and prenatal yoga are all excellent tools for this. These forms of birth preparation have similarities to bodywork; when we stretch our bodies, we are also stretching our internal beliefs and feelings, because our bodies and our minds are inseparable. It can be hard, outside the birth room, to realize how deeply we can go into our bodies during birth. For me this was one of the most powerful realizations after I gave birth to my first baby, Emma, and I was very thankful for my yoga practice, which had so beautifully taught me 'yoke' my body and mind (as the word yoga translates.)"
- Dr Sarah Buckley, a family physician & widely recognized authority on pregnancy, birth & parenting (Gentle Birth, Gentle Mothering)
"Is it possible a few simple exercises could help women avoid cesarean sections? Many pregnant women have told us that by preparing ahead of time, they were ready for labour. These exercises and relaxation practices (pelvic rock, kegels, walking, side-lying position, squatting) are most effective if practiced on a daily basis for at least three months before birth."
- Dr Robert A. Bradley, began practicing obstetrics and gynecology & promoting the principles of true natural childbirth in 1947 & wrote the 1st edition of Bradley method book in 1965 (Husband-Coached Childbirth)
"Exercising improves your mobility and eases pain. Doing exercises specifically to strengthen your pelvis can reduce back pain by over 50 percent and dramatically lower your risk of chronic pain one year after delivery. One way exercise works is by reducing inflammation. Inflammatory chemicals that descend on a new injury stimulate nerve fibers, sending pain signals back to your brain. Exercising for 45 minutes to the point of mild breathlessness three times a week reduces inflammation by about 25 percent comparable to the effects of some anti-inflammatory pain medications. Many doctors tell their frustrated late-in-pregnancy patients to just take a walk around the block. This is a good advice. The weight of the baby pressing against the cervix as you walk, combined with other hormonal changes associated with exercise, has been shown to trigger labour."
- Dr Robert Greene, leading hormone specialist, board certified in ob-gyn and reproductive endocrinology (Perfect Hormone Balance for Pregnancy)
Diagram below summarize benefits of exercise to pregnant mothers