Table 1 Exercise pool modified from a recently published conceptual progression framework [64]

1. Static standing^a

Eyes, stance, head movement (yaw and pitch), cognitive tasks

2. Compliant surface standing^a

Eyes, stance, head movement

3. Weight shifting^a

Shifting limit, shifting speed, shifting direction

4. Modified center of gravity^a

Arm raising speed, surface (firm, compliant and ramps), head movement

5. Gait

Walk with different speed and head movements, high march^a, step over shoe box^a, sidestepping, walk on heels/toes^a, backward walking^a, figure-of-8 walk, tandem^a; cognitive tasks