NASM Group Fitness Instructor Practice Exam Prep & Study Guide

The hormone relaxin plays a significant role during pregnancy by influencing the body to prepare for childbirth. Its primary function is to increase the flexibility of the ligaments and joints, particularly in the pelvic area, which facilitates the birthing process. This loosening of connective tissue can lead to decreased joint stability.

As the hormonal levels change, relaxin affects not only the ligaments but also the surrounding muscles that support the joints. The reduced stability can make joints more vulnerable to injury, as the body adapts to the physical changes and increasing weight of the fetus. This is essential for childbirth, but it can pose risks for the pregnant individual when it comes to maintaining stability and balance in everyday activities.

The other options may encompass beneficial effects in different contexts, but when focusing specifically on the physiological impacts of relaxin in pregnancy, the most relevant outcome is the decrease in joint stability.