Saves Energy – 

When you drink water, it takes energy to move it.Water movement through the cells in the body is done primarily through special channels in the cells called aquaporins. A single aquaporin can move over a billion water molecules per second into a cell. Aquaporins pull water molecules into cells using a positive electrical charge. Because ionized alkaline water carries a negative charge, it is easier for your body to absorb it. Your body simply uses less energy to hydrate itself!

Makes Energy – Ionized alkaline water can help the body make energy by helping the muscles to run more efficiently. Muscles make energy by burning glucose, most of the time they use oxygen to burn glucose which is called aerobic metabolism. But when you exert yourself, they make energy without glucose which is called anaerobic metabolism –energy made without oxygen. The problem is, anaerobic metabolism is limited, you only get short bursts, and the body gets fatigued. Alkaline water helps the body absorb oxygen more efficiently, because of this, the muscles are able to use aerobic metabolism more of the time. Athletes know this, and they alkalize their bodies prior to working out to maximize their aerobic metabolism.
More aerobic metabolism = more endurance = more energy.