Table 4.

Description of critical tasks for comprehension assessment. The participant was asked to demonstrate their understanding of the safety icon and statements.

Statement	Success criteria
DO NOT use [InTandem] if any of the system materials are damaged (to prevent risk of electric shock)	Demonstrates understanding to not use damaged materials
To prevent the risk of injury from a slip, trip, or collision: attach and remove the foot sensors from your shoes from a stable position such as sitting down	Demonstrates understanding to put sensors on from a stable position
DO NOT use [InTandem] with the volume very loud or in loud surroundings because it may hide safety cues, such as emergency sirens or cars honking.	DO NOT use [InTandem] with the volume very loud or in loud surroundings because it may hide safety cues, such as emergency sirens or cars honking
Use [InTandem] in a safe walking area. Do not use in poorly lit areas (to avoid potential obstacles) Do not use in areas with obstacles or potential hazards in your walking path, such as tables, chairs, rugs, pets, pedestrians, or traffic Do not use in areas with uneven, wet, or icy terrain	Demonstrates understanding to not perform walking sessions on uneven surfaces (stairs, ramps, or wet surfaces) or in crowded locations with many obstacles
To help [InTandem] work properly and ensure accurate step detection from the foot sensors: Use [InTandem] in areas where you can walk at least 20 steps in a straight line before turning. Avoid locations with high noise levels that may limit your ability to hear system instructions and music. Avoid uneven walking surfaces (such as frequent stairs, ramps, or hiking trails) Do not use [InTandem] on a treadmill	Demonstrates understanding to perform walking sessions in a flat environment, not on a treadmill
Do not walk while looking at the [InTandem] touchscreen device	Demonstrates understanding to not view their device during walking sessions
Do not continue using [InTandem] if the walking exercise becomes too difficult. Take breaks as needed. A session can be paused and resumed on the touchscreen device screen at any time throughout the session. If you ever become uncomfortable or feel unsafe with the speed of the music, walk at your natural pace. The speed of the music will adjust back to the starting pace of your walking If you experience muscle or joint pain or discomfort that you normally do not have, stop using [InTandem] and consult a medical professional If you experience any abnormal symptoms such as nausea, shortness of breath, or excessive fatigue, stop using [InTandem] and consult a medical professional	Demonstrates understanding to not walk if they become too tired or experience a health issue