I feel your pain. Literally. I walk regularly, and in summer I swim daily, but due to my other health issues, it's hard for me to do a traditional "work out" (although in my younger years I worked out regularly and even worked at a gym) per se (i.e Curves, Bally's, etc). I am considering taking Pilates or Yoga class, as I need something overall that is low impact, and non weight bearing for my upper body (nerve damage in my upper right quadrant) and I have serious arthritis in my feet, ankles and hands, and I can't over do it, or my condition can get worse.
I knew I wasn't exactly optimally "conditioned" for re-entering skiing, but I love the sport and wanted to participate to the best of my ability. It hasn't been nearly as bad as I thought it would be. My quads, but particularly my calves are also very taxed. The Fischer's require some input, per discussion in the other thread. I can do two or three hours skiing at a clip, then I have to break for a bit. I am sore, and the first couple times my calves really cramped at points, but when I get home I jump into my Jacuzzi and then put arnica gel on, pop an Advil and I am pretty good to go, although I do feel still feel it to some degree the next day.
I ski on the same boots/skis as you for the most part...Solly/Fischer. I think the Sollys have a pretty aggressive forward flex compared to my old boots, so you really have to stretch. I have large calves, and the cuff is a bit narrow. Each time I ski, it's gets better, but I still hurt a bit. I've been doing warm ups and some additional exercise at home to get past the hump, but until that muscle conditioning kicks in, I just expect it. Stay with it and try to take it in small bites. If you can do some mid-week flexibility/stretching/strengthening exercises, you'll get there more quickly. I try to do squats and calf stretches in sets around the house as much as I can. Even if you can't stick to a gym routine, at home stretches and squats should help!
Anyway, I'm right there with you (not quite as bad, but I'm there) so I can totally relate. Don't worry about being "sporty" or "athletic", if you like to ski, just do it. I was very conditioned when I was younger, but due to an autoimmune disorder, I'm not in the shape I once was...and keep my expectations reasonable. Baby steps. A few changes in your conditioning and taking it in small doses will help you feel better and stick with something you like to do! Hope all the great advice here works for you, but I know it always helps to know there are others who can relate and are going through the same conditioning curve (also the boot fit advice is good to check out too).
BEST!!! Hang in there!!!! YOU CAN DO IT!!!