Too-tight jeans are linked to low fertility in men, but it turns out that young women don’t get off scot-free. Extremely tight denims bring the knees closer together, causing an abnormal stride, says Janice Novak, author of “Posture: Get It Straight” (Expert Publishing, $16.95).
“When your hips don’t have normal range of motion, you get back pain,” Novak says. “Some muscles become excessively weak because they’re not working like they should, while others overwork.”
The solution will seem obvious to parents, if not to teens and tweens. Ditch the skinny jeans, or at the very least wear ones with a little stretch or spandex.
How can you tell if her jeans are too tight? If she can lift her knee to her chest without any trouble, the jeans are probably OK.

