Position adjustable pulley higher than intended height but within arms reach from bench. Position bench under cable bar. Lie supine on bench. While lying on bench, reach over and lower each pulley into intended position so that cables are taut in lowest position with bar on chest. Grasp bar with both hands using wide oblique overhand grip.
Press bar upward until arms are extended. Lower bar to chest or until slight stretch is felt in shoulders. Repeat.