Stand with feet about hip-width apart and a barbell over your mid-foot. Hinge at the hips with a flat back and grip the barbell with an overhand grip just wider than shoulder-width. From this bent-over position, explosively pull the barbell up to your lower chest/upper abdomen, keeping your torso parallel to the floor. Let the barbell return to the floor after each rep so it touches before the next pull, then repeat.
Log your barbell pendlay row sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.