Nope, not pull-ups — this is the one bodyweight exercise you need to build strength and muscle in your back and biceps without weights

Build strength and muscle in your back and biceps muscles, and improve pulling power using the bodyweight row. Here's how, according to a personal trainer.
The Gazette

Build a Better You: Know the difference between a pull-up and a chin-up

Both pull-ups and chin-ups work back muscles, but each works different muscles and uses a different grip. Knowing the ...
Military.com

Circuit to Improve Pull-Ups: First Strength, Then Muscle Stamina

Many people struggle with pull-ups at first, but with practice, this exercise can be rewarding and can build upper-body pulling and grip strength. Fortunately, you can still build the necessary ...