A client in cardiac rehabilitation would like to eat the right foods to ensure adequate endurance on the treadmill. Which of the following nutrients is most helpful for promoting endurance during...

A client in cardiac rehabilitation would like to eat the right foods to ensure adequate endurance on the treadmill. Which of the following nutrients is most helpful for promoting endurance during sustained activity?

1. Protein.

2. Carbohydrate.

3. Fat.

4. Water.