Bone density increases with strength by way of muscle growth. Whites with a ton of muscle can swim and their bone desnity is off the fucking charts. Additionally when you life insane weights, your bones experience growth in the same genetic growth system as muscle does, and is strengthened. When Eddie Hall was Deadlifting 400 pounds his shins could not hold up 1100 pounds, regardless of muscle strength. He lifted 1100 pound deadlift in '16 and his bones were fine.