Loading metrics Open Access Peer-reviewed Research Article Daisey Vega , Helen J. Huang , Christopher J. Arellano Daisey Vega, Helen J. Huang, Christopher J. Arellano Published: March 23, 2022 https://doi.org/10.1371/journal.pone.0265750 Figures Abstract We recently discovered that a rope-pulley system that mechanically coupling the arms, legs and treadmill during walking can assist with forward propulsion in healthy subjects, leading to significant reductions in metabolic cost.