Stefan Rivera maintains a built physique year-round. In the workout below, he provides exercises to hit some of the most important upper body muscles. If you want to really build and define your upper body, give this workout a go!

Workout Breakdown

Fuel your workout with Nutrients, not stimulants. Pre JYM - The True Performance Pre-Workout

Pre JYM

Pre JYM 20 Servings - Orange Mango

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