Which of the following is a fault observed in the air squat?

• A. Poor foot placement tolerance
• B. Unbalanced breathing pattern
• C. Loss of midline stabilization:flexion (flexed spine)
• D. Depth progression issues

Answer: (C)

Maintaining a braced midline with a neutral spine during the air squat is essential for a safe, efficient squat. When you descend, the torso should stay tall and rigid so that the hips, knees, and ankles can move without the core buckling. A fault shows up as the spine flexing or rounding, which means the midline isn’t stabilized. This loss of midline stability shifts load into the lower back, reduces your ability to transfer force through your hips, and makes the movement less powerful and more risky.

So the observed issue—flexion of the spine with a loss of midline stabilization—fits the pattern of a squat fault because it directly compromises spinal position and core tension, both of which are required for a solid, safe squat.

Other options describe problems with stance, breathing, or progression depth, which are different aspects of the movement and don’t indicate midline instability in the same way.