Media Summary: Every gym bro loves big arms and smashing 21s. Let me show you how to take this classic sleeve splitting Learn all about how to properly execute the This classic bodybuilding technique called 21s will help you add mass and strength to your upper arms. Here's how to do it.
21 Exercise 3 Assigning User - Detailed Analysis & Overview
Every gym bro loves big arms and smashing 21s. Let me show you how to take this classic sleeve splitting Learn all about how to properly execute the This classic bodybuilding technique called 21s will help you add mass and strength to your upper arms. Here's how to do it. In this shorter video we talk about the bicep training technique '21s' and why they are possibly the single worst training technique ...
![How To Do 21s [one of the best bicep exercises]](https://i.ytimg.com/vi/oq7jXQP3Fk8/mqdefault.jpg)
