Sweaty after the gym

I'm a hairdresser
We recommend that hair is not washed everyday, shampoo damages your hair because it opens the cuticle to help remove dirt and oil. If you do this too much your cuticle becomes weak and damaged, allowing hair breakage, chemical damage, sun damage etc.

Never let your hair become 'squeaky clean' this is the first indicator that your causing damage to your hair cuticle!!

If you need to shampoo everyday, avoid using a harsh shampoo, try a purifying shampoo which is gentle on the hair because they are usually used to break down product and oil build up but are gentle to damaged hair(which could be caused by too much shampooing).
Make sure you condition, long hair should only need conditioning on the ends unless you have particularly dry hair.

Our recommendation is to wash every other day but we usually say this depends on lifestyle/length of hair/condition of hair. If you feel uncomfortable leaving your hair for a day after a gym workout then I would just say to wash it. Like I said above, just a gentle purifying shampoo and a conditoner(suitable for your hair type) will be best.

I bought an all natural shampoo that has no sulfates to use most days (because I do wash it every day). I think it's called Avalon organics, or something like that. I tried the whole "no-poo" thing and HATED it soooo much. I went as long as I could looking like a refugee before giving up. I make sure to use a high quality conditioner, though.

Super hot water is horrible for your hair, I would be finding another hairdresser because she obviously doesn't have a clue what she is talking about. My hair is to my tailbone and I often struggle with the to wash or not question. It is horrible on your hair if you wash it too often. You need the natural oil from your scalp to make beautiful shiny hair. I get a lot of compliments on how soft and shiny my hair is and I believe it is because I only wash my hair 2-3 times a week. Otherwise I dry it out and take away the shine. It is very hard to balance working out every day with non-oily hair though. I try not to worry about it until we are going out of the house.

How the hell did you find a thread from September of last year? Don't people check dates before responding to things?

could just rinse with water & condition. and use a headband when you work out.

but in case you have any skin issues - your hairdresser may like your cumulatively conditioned hair, but if it spends a lot of time near your face, your dermatologist or esthetician might not. If that's a worry, happy medium: do 1 (not 2) washes with at least a little shampoo, use conditioner (not leave-in), air dry or just give it a couple of blasts with a hairdrier.

(my hair definitely looked better after cutting washing down to a couple of times a week, but my skin freaked out)

I wash mine everyday with shampoo, condition it every second day and use a treatment twice a week. My hair is in the best condition its ever been in.