Spinach Boosts Muscle. Popeye Was Right!

"They found that eating 300g of the vegetable reduced the amount of oxygen needed to power muscles by as much as five per cent when exercising. The effect is so powerful it works after just three days. The secret is not iron but nitrates which are abundant in the vegetable. These chemicals make the mitochondria – the "engine rooms" of every cell – more efficient, they found."