I agree. Water is a great washing agent. It sounds like nothing happens. But, water can lift excess sweat, "subem," off your hair. And, these essencials, the same stuf,f can keep your hair extrememly healthy.
Make sure you rinse your hair with luke warm water. I can't express enough on the right temperature. Shower water is conditioned to your skin temperature and it's too HOT. What happens is the hair strands open up, the scales expand. The moisture and the oils leave, and, dry hair and split ends happen. If you shower after your workout make sure the water rinsing your hair is luke warm.
Problem with that. You will feel cold. Unless you rinse your hair first, then shower with your hair up. Then, it drips on you... cold hair. You feel cold.
Many women rinse there hair in a sink. It's inconvienent. But, great for your hair.
Shower with your hair up so it doesn't rinse in HOT water. Then, after your shower, rinse your hair in a sink with luke warm water for many minutes.
The number one rule for any one with long hair. Use LUKE WARM water. Never hot water on your hair. You will kill it. So... a special temperature is needed... luke warm water. Never use HOT. You will kill your hair!