A normal surface is any surface that is hard, smooth, flat, not carpeted and not slippery.
The foam should have a height of 10 cm, length 204 cm, width 44 cm and a density of 25 kg/m³ (40% DIN 53577). The length is necessary to accommodate tandem walking tasks.
A simple armless stool without rollers and adjustable in height should be used. The height of the stool should be adjusted so that the test person’s knees form a right angle. The starting position for the arms should be hanging down, not resting on the knees.
As shown on the left the set of stairs needs two upward and two downward steps with a step height of 23 cm, step depth 32 cm, step width 40 cm and preferably no handrails, but with non-slip plastic covering.
Construction bricks (about 21 cm high) and wooden slats (3 x 3 x 120 cm) can be used as shown here. When the wooden slats are laid across the bricks, they act as a barrier 24 cm high. Four such barriers should be used spaced 1 m apart.