I tend to shampoo and condition my hair on Sundays, mostly because I feel like I need it after a weekend and I like to start the week fresh and clean. I don't force it though. If I don't need it, I don't do it.
Right now I'm using Surface Bassu Hydrating shampoo, masque and hydrating oil. I absolutely LOVE the smell of the shampoo and masque. The oil leaves my hair feeling soft, looking shiny and keeps frizz at bay for the most part. A little goes a long way and all 3 products have lasted me quite a while.
I usually let my hair dry about 75% of the way and finish the rest with a blow dryer and round brush. My hair dries a little crazy if I don't do anything and I feel like it looks cleaner longer if I use a blow dryer on day 1.
Day 2 and on really depend on my day. I wear the blow out for 2 or 3 days. By then my hair is looking a little lackluster so I use dry shampoo to liven it back up. My go to is Oscar Blandi Pronto Dry Shampoo, it is amazing/a lifesaver/ pretty inexpensive. It has a light citrus scent and leaves your hair looking and feeling clean. I've also tried Serge Normant Meta Revive Dry Shampoo and while my hair looked clean, it didn't feel it. I would reserve this for using the very last day before your wash. It almost leaves a hairspray feeling in my hair after use. After my blowout has lost most of it's life I rely on my curling iron to bring some body back into my hair.
There really isn't a science to it, it all depends on what you're comfortable with and how you normally wear your hair. Some other questions I had were about gym days. If I'm planning to work out, I always pull my hair up on top of my head and out of my face and do my best to wipe my brow with a towel instead of letting my hair absorb it all. If I get sweaty and feel like my hair needs to be washed again, I take a hot shower and use my fingers to massage my scalp under the water, just the way I would if I was shampooing. It helps wash your scalp and distribute your hair's natural oils throughout your entire head.
Even if you aren't ready or just aren't interested in changing up your whole routine, skipping a couple days a week makes a big difference. Just think going from every day to every other takes you from 365 days a year days of shampooing, conditioning, blowdrying and brushing to just 182. The only tips I can think that have helped me are: try to touch your hair (especially the roots) as little as possible, don't be afraid of using dry shampoo, avoid using a lot of holding products if you can and sleep with your hair down to avoid waking up with wonky hair tie crimps. If you find a routine that works for you, go with it.
I hope this clears up some of the confusion around my hair care routine. I'm curious for those who go days in between washes, what is your routine? Are there any products you can't live without?