Though it seems getting into the mindset of "well I'm going to gain weight anyways" makes sense when trying to get pregnant, it's really not the way to go. Thinking about the health of oneself and one's future child will put things into perspective. The healthier your body is, the healthier your child will be, the better your body will feel, and the better your labour will go. Learning to breathe through yoga will help your body learn to relax and breathe through discomfort. According to fitandhealthpregnancy.com "pregnancy strength training will:
• Reduce back pain • Increase your energy levels • Make labor and delivery easier • Keep you strong and injury free • Combat postural changes during pregnancy • Make post-partum weight loss MUCH easier and faster • Flatten your tummy after delivery."
It says that if you are exercising regularly before pregnancy, there is no reason not to continue after. Perhaps there will have to be changes made to protect your changing body and the baby but I, for one, am glad to hear that regimens don't have to change completely with pregnancy! However, if one doesn't have a regimen in place before pregnancy, easing into one is recommended.