Movies showing the evolution of walking capacities with EES over the course of the rehabilitation program for the three participants. Conventions are the same as in Supplementary Video 2. Similar observations were made on at least 5 different days for each participant and condition. Video originally published by Wagner et al. in Nature on 31 October 2018 under title "Supplementary Video 4." Original URL: https://www.nature.com/articles/s41586-018-0649-2