Mike reporting in to take you through an all out massive shoulder attack workout. This full assault workout will give you cannonball shoulders and make you look simply huge. Gear up and get ready to hit it hard. Workout breakdown: In order to put on mass, you must use an exercise that allows you to use the most amount of weight possible. For this reason, the push press is the perfect exercise for shoulder mass. And since we are using such heavy weight, remember to always keep your core and glutes tight throughout the entire movement.