Okay! This is where I come in. I teach pre natal exercise. Some VERY important things to consider. NOTHING related to prenatal exercise and sports is expert advice, even from me, who's been teaching this for a long time. Why? Because in the free world, the research involved in testing sport and exercise on women in various stages of pregnancy, is not, has never been, and hopefully never will be tested on human subjects. At Cornell, there is a lab that puts pregnant sheep on treadmills and draws hypothesis about humans from those findings. Ethical considerations aside, take of that what you wish.
Here are the issues. Every pregnancy is different, even in the same woman. To judge what you can do by anecdotal information is about as intelligent as using the same medical perscription as someone else.
One thing we always tell participants; Never start a new activity while pregnant. I've heard of ski instructors, under age 30, who have skied since childhood, and continued to ski until close to the time of birth. That's fine. I know that Edie Thys wrote an article in ski magazine on this subject.
But lets take a woman in her mid to late 30s, who has not skied very often. Add to that, make her a "lowlander", and bring her out to Colorado. You can have some problems.
One thing that concerns me , lately. Any drugged out, disease laden inner city girl can crank out a kid a year, no problem. But the fitness centers are full of extremely healthy 20 something females who not only have trouble conceiving, they are also prone to miscariage. Any woman with that sort of problem would probably need to avoid skiing. NOT because the skiing would cause her to miscarry or being infertile. I truly believe that a healthy fetus can withstand anything. How did the cave women survive running from the saber tooth tiger, and still manage to reproduce? But if something happened, she would always blame it on the fact that she went skiing, and would have to deal with the guilt.
Here are some physical considerations. As a woman becomes more pregnant, there is a hormone called relaxin, that helps loosen the pelvis for labor. The problem is, on some women, the hormone has a systemic effect, causing the joints to be wobbly and unstable. This problem can be prevented by doing strength training and stability exercises, but unfortunately, many women opt for "feel good" yoga type exercises exclusively, making the body hyperflexible and a menace on skis to herself, her child, and anyone around her.
Off my soap box now.
Be Braver in your body, or your luck will leave you. DH Lawrence