Walking with resistance band around waist (behind) ('Gait' Walking forward, with resistance behind; 01)

Stand up straight with a clear path in front of you.
Ask an assistant to place a resistance band around your waist, and have them hold both ends whilst they stand behind you.
Walk forward in a straight line whilst the assistant applies a resistance against your direction of walking.
Aim to keep walking at a steady pace with a normal step length.