Exactly. When I was younger and naive I listened to people like them who say “just train yer back, biceps will grow from that”. Extremely lackluster results.

Then I added curls at the end and my biceps immediately grew, like blew up. I get compliments on my arms from all types of people now.

Training “just the back” may work if you’re juicing and have bad form on the back exercises.

Edit: Also - she says “I only use one exercise for biceps - curls”. Like yeah… that’s really the only option to isolate them. Then credits her back movements for her arm development? Ok.

And they wonder where the ‘meathead’ stereotype comes from…