If you read my articles you know that explosiveness is largely dependent upon strength, and strength is fairly influenced by muscular growth, or hypertrophy. In this article I'd like to address another topic along these lines and this the topic of functional vs non-functional hypertrophy. Non-functional hypertrophy refers to gains in muscle size that aren't associated with an improved capacity to produce force. "Functional" hypertrophy refers to gains in muscular size that improve maximal force production, and thus carry over into the real world. Simple enough.