Body composition and athletic performance are inseparably intertwined topics. Body composition is good for health, self-esteem and performance. Athletic performance is good for health (body is built to move), longevity (3 factors) and body composition (burning calories vs. consuming calories vs. desired body comp change) vs. stimulus for change (calorie deficit for fat loss until the body adapts AND resistance training for muscle / strength and/or endurance training for mitochondria biogenesis)