I don't really do a "routine" although I generally start my clients prone. I'm very new to massage work, so I'm not sure how this will evolve in my case. In general, starting prone works for the clients I've seen because when asked, most of them have back, shoulder or neck issues. Therefore, I start out there. Even if you think another area needs more attention to decrease pain in the shoulder/neck/back area, I think it kind of puts clients at ease to physically assess/touch the area of complaint so they know you are addressing and considering it. Of course, you can verbally tell the client that you are or are going to address any areas of complaint, but I think sometimes it takes a physical touch to assure them of that.
I guess my input here is kind of circular. I guess the reason I don't have a routine is because I always start at the area of complaint and go from there. It's such a rare instance that I've encountered a client that has absolutely no ache or pain anywhere.
I guess it could still get "boring" for the client. I kind of get bored myself if I find people coming in with really similar complaint areas, so I change things up on my own to keep the massage more alive and active and keep me alert and from going on automatic. That automatic feeling is one I do not enjoy at all! and I'm sure any client can tell when their therapist is on auto pilot.
When I feel that auto pilot feeling come on I really focus in on details I encounter with my client. Look for changes and alterations in their body from one session to the next and there might be new things you notice to spend a few moments addressing which will in turn change up the routine for the client.
Even though I generally start my clients prone and start at the back then follow a general order I never greet my client with that idea. That way if a client comes in with a certain complaint or a certain energy or area of tension it doesn't totally throw me off and each interaction is unique-even if somewhat predictable?
Hope this isn't too convoluted and somehow answers the original question! and hope something here can help in some way!
edit: i also wanted to add that whenever things seem too routine or the feeling of just doing my job/auto pilot comes on i focus in on my thoughts too. this might sound strange but i try to change any sort of lack of focus or boredom on my part into thoughts like, "wow, [client] you are so cool!" and "it is so cool to have this privilege to be a massage therapist!" and "i love what i'm doing" or even just saying "happy, happy, smile" in my head, lol. it's interesting because sometimes when i start doing this i will look at my clients face (if supine) and occasionally a really peaceful, soft face with a little smile even sometimes comes across them! p.s. i do keep my thoughts silent! but at least if one slipped out it wouldn't necessarily upset anyone! haha.
i swore to myself i would only settle on a fun job so i do all i can to keep it that way!