I admit, I get distracted easily (bight shiny objects.... prettttyyyyy), but it's pretty shortlived before I go back to my old habits.
I do like my routine and have developed some "foundations" that I rotate when I get bored. I have found that mixing it up all the time presents more chaos than balance. It's easiest for me to stick to a routine I can do with ease (not physically easy, mind you, but planning-wise).
It's kind of the same with food. I'm a creature of habit, to a fault. I work in a place where I order off of a restaurant menu and yet I get the same flippin' thing every single day. Drives my coworkers nuts