Key numbers
1 to 12 inches
Acceptable free-foot clearance
What Systematic recommends
Where to start
- Stand next to the wall or stable surface with bare feet flat on the ground. Reach to the wall with two fingertips, using only very light contact.
- Keep your eyes focused straight ahead on your chosen visual point. Maintain awareness of the tripod points of contact through the standing foot. Keep the standing knee soft and active. Stand tall throughout the hold. Breathe normally.
- 3 sets. Begin with a 10-second hold. Progress in 10-second increments. Work toward a 30-second hold. Use as little fingertip contact with the wall as you can comfortably control.
Condensed from the published Development Pathway (Single-Leg Balance: Two Finger Wall-Assist Tripod Stand). This is a starting point, not a training program or medical advice.
Why the free leg matters
Schneiders and colleagues (2016) studied foot position in single-leg stance with and without vision in forty healthy young adults. Eyes-closed performance was sensitive to free-foot position, which supports standardizing where the free foot goes.
The Systematic setup, a natural step with the foot about 1 to 12 inches clear, is a defined range and Systematic's own protocol choice. The study did not validate that clearance range.
How Systematic standardizes the position
The test is done barefoot, eyes closed, with one attempt on each side. The free foot is lifted completely clear of the floor, in a natural-step position, and approximately 1 to 12 inches of clearance is acceptable.
The free foot or leg may not touch, rest on or lock against the standing leg. The timer stops at the first fault, and the faults include either hand leaving the hip bone, the free foot touching the floor, the free leg touching the standing leg, or the standing foot hopping or materially shifting. Natural sway at the ankle, hip and trunk while the standing foot stays planted is not a fault.
What the test does and does not measure
Systematic uses the eyes-closed hold to challenge how the body combines sensory information to control posture, not to isolate one joint, one muscle group or the sensors in the foot. It makes no claim about foot-to-brain wiring, and it is not a diagnosis of any one sensory pathway.
The evidence
Each cited source is labeled according to how it supports the particular claim on this page. Direct test evidence, underlying-capacity findings and population reference values are distinguished from Systematic-defined protocols and standards. Historical development notes are retained internally rather than presented as public evidence. A study of an underlying capacity is never presented as validation of the Systematic test itself.
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Underlying-capacity evidence
Schneiders et al. (2016). Effect of foot position on balance ability in single-leg stance with and without visual feedback. Journal of Biomechanics.
What it found. Eyes-closed single-leg performance was sensitive to free-foot position.
What it does not show. It does not show that one free-foot position is best for everyone, and Systematic's 1 to 12 inch position is its own choice, not taken from this study.
The Systematic Healthspan Assessment is a physical baseline. It is not a diagnosis, and it does not estimate a biological age, a disease risk or a lifespan.