Pump iron? Eat wild salmon. This fish is the best source of dietary omega-3 fatty acids, which increase the elasticity of the blood vessels, allowing blood to reach your heart and muscles faster. “Omega-3’s also protect against inflammation, and some studies have shown that eating salmon post-workout may reduce muscle soreness,” says Jennifer McDaniel, R.D., owner of McDaniel Nutrition Therapy in Clayton, Missouri. Salmon is also rich in leucine, a hugely important amino acid that improves muscle strength.