[Verse 1] Two rooms downstairs, but they don't share the load One's built for distance, one's built for the road right next door Right side breathes easy, a short little cruise to the lungs Left side's the engine that answers to everyone Every finger, every toe, every muscle that moves Every thought in your skull that your left side proves It's pushing red rivers through highways unseen Against the resistance of the whole machine [Chorus] Left is the heavyweight, built like a fortress wall Three bricks thick where the right side's got one, that's all High pressure hero, sending blood head to toe Thick wall, strong wall — that's the muscle you should know Left side lifts the whole wide map Right side's just a lung-length lap [Verse 2] Picture the right chamber, thin as a whisper, light Just a gentle nudge to the lungs and out of sight Low pressure, easy breeze, a hallway, not a hill But the left one's a mountain climber, testing its will It's got to reach the scalp and the sole of your feet Push through a thousand miles of arterial street So the body built it thicker, layer on layer of might Muscle stacked on muscle to win that uphill fight [Chorus] Left is the heavyweight, built like a fortress wall Three bricks thick where the right side's got one, that's all High pressure hero, sending blood head to toe Thick wall, strong wall — that's the muscle you should know Left side lifts the whole wide map Right side's just a lung-length lap [Bridge] Feel the squeeze, feel the surge, feel the pressure climb Left ventricle keeping the whole body in time Not a rival, just a partner running different lanes One for the lungs, one for the far-flung terrains Thicker walls don't mean the right side's small It just doesn't need to conquer them all [Verse 3] So when you feel your pulse knock against your chest That's the left side working, giving its very best Three times the thickness, built to take the strain Pumping past your shoulders, down through vein after vein From your scalp to your ankle, it's covering ground That's why the left wall's the thickest one found [Chorus] Left is the heavyweight, built like a fortress wall Three bricks thick where the right side's got one, that's all High pressure hero, sending blood head to toe Thick wall, strong wall — that's the muscle you should know Left side lifts the whole wide map Right side's just a lung-length lap [Outro] Thick wall, big job, pushing far and wide Left side's the reason blood reaches every side Head to toe, head to toe, that's the story told Left side strong, left side bold
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