What is Forearm Muscles in BJJ?

The forearm muscles control wrist movement, finger flexion, and grip. In BJJ, these muscles are constantly engaged during training, particularly in gi where sustained gripping is required. Forearm fatigue (commonly called "getting your forearms pumped") occurs when the muscles are overworked and fill with lactic acid. Building forearm endurance through training and supplemental exercises improves grip stamina during training and competition.