One of the most effective machines for building back muscle in the gym is the lat pulldown machine, according to fitness experts. However, if you don't have access to one, there are alternative exercises you can do. These include the seated isometric lat hold, which involves pushing your shoulders away from your ears while holding onto two chairs or benches. Another option is the seated banded lat pulldown, where you anchor a resistance band and pull your elbows down. For a challenge in both the beginning and end of the motion, try the band-resisted dumbbell row. Lastly, the seated pullup or chinup is a scaled-down version of the classic pullup that allows for easier customization.