ACE Personal Trainer Practice Exam 2026 – 400 Free Practice Questions to Pass the Exam

The correct answer highlights that the pelvis needs to be mobile and able to move freely in relation to movement. The pelvis plays a crucial role in various physical activities, providing a base of support and serving as a connection point for both the upper and lower body. Mobility in the pelvis allows for effective transfer of forces between the different parts of the body during activities like walking, running, and lifting.

Movement of the pelvis is essential for achieving a full range of motion in the hips, which, in turn, facilitates proper biomechanics during dynamic activities. When the pelvis can move freely, it enables better alignment and reduces the risk of compensatory movements that could lead to injury.

While stability is important for maintaining balance and supporting proper posture, the dynamic nature of many movements requires that the pelvis also be able to adapt and shift appropriately. This adaptability is particularly vital for effective locomotion and coordination during various exercises or sports activities. Thus, the function of the pelvis is best served when it retains a degree of mobility.