Sit at a plate-loaded high row machine and grasp the handles with a reverse (underhand) grip. Keep your chest up and core braced. Pull the handles down toward your torso by driving your elbows back and squeezing your shoulder blades together. Slowly return the handles back up under control until your arms are extended, then repeat.
Log your lever reverse grip high row (plate loaded) sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.