Table 1.

Rating criteria for single leg squat: good and poor stability.

Single Leg Squat
Good	Poor
1. Overall Impression
Smooth, good-quality movement General control Controlled change-over between repetitions Ease of movement	Staggered movement Increased speed to attempt to control movement Effort to control movement Trunk “wobble”
2. Weight Transfer
Minimal translation of centre of mass Upright trunk	Discernible translation of centre of mass Trunk leaning forward or to side Extended time to transfer
3. Lumbar Spine & Pelvic Alignment
Minimal movement in all three planes Frontal plane: ASIS level Sagittal plane: minimal A-P tilt, rotation Lateral view: stable lordosis, minimal trunk flexion	Discernible movement with pelvis tilting up or down, rotating toward or away from weightbearing leg, tilting in anterior or posterior direction Lumbar lordosis increasing or trunk flexion occurring
4. Leg Alignment
Minimal movement out of the starting plane of movement. This takes into account the alignment of the limb, influenced by pelvic width, and Q angle at the knee	Discernible movement out of the starting plane of movement
5. Foot Alignment
Neutral foot position—remains stable during movement	Excessive pronation of foot during squat descent Externally rotated starting position of lower leg/foot