Swole AF: Hulk AF is a stim-free pre-workout that provides an insane vascularity and muscle fullness to give you a "super swole" look. This product is designed to enhance gym performance without the added side effects of stimulants like jitters or a crash. Hulk AF produces visible results. This is a great pre workout for PM training because you can take it at night without worrying about affecting your sleep. Swole AF Labs produces only the best products and Hulk AF has not fallen short.