Stand with feet hip-width apart and hinge at the hips with a flat back. Hold a barbell with one hand, letting it hang straight down. Keeping your core braced, pull the barbell up toward your hip by driving your elbow back and squeezing your back muscles at the top. Slowly lower the barbell back to the starting position under control. Repeat on the other side.
Log your barbell one arm bent over row sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.