This one’s pretty obvious, but there was no way we’d leave it off the list. Spinach is one of the most nutrient-dense foods out there, boasting high levels of vitamin K (important for bone health and blood clotting), vitamin A (important for eye and skin health) and iron (needed to transport oxygen throughout the body). If you’re deficient in iron, you will experience fatigue, which is the last thing you need when you’re trying to fit in gym time.
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