Which of the following is a core component of physical readiness training that focuses on movement and range of motion?

• A. Endurance.
• B. Mobility/Flexibility.
• C. Strength only for heavy lifting.
• D. Speed and power exclusively.

Answer: (B)

Movement and range of motion are built on mobility and flexibility. Mobility is the ability to move a joint actively through its full range with control, while flexibility refers to how well the muscles and connective tissues lengthen to allow that range. When you have good mobility and flexibility, your joints can move efficiently, your movement patterns stay clean, and your body is less prone to compensations that can lead to injury.

This is why mobility/flexibility is the focus here: it directly addresses how well you move and how much range you have, which underpins safe and effective performance in everything from daily tasks to training. If hips, ankles, shoulders, or the spine are stiff or tight, it can limit how you perform even basic movements, making endurance work, lifting, or sprinting harder and riskier.

Endurance builds sustained effort, strength builds the ability to generate force, and speed/power train rapid, explosive movements. None of these center on improving movement range and tissue length in the way mobility and flexibility do, so they don’t address the core need described.