There is online personal training via Skype. That's a cheaper version of a fitness trainer which you can do from home over video, using little or no exercise equipment. That site charges $45/session for one-on-one training, where you work with a trainer who develops workout routines for you, teaches you exercises, corrects your form, and so forth (like in-person training). They also have small group sessions, and you can try one of those for free. They also have a nutritionist.

I should mention that I know about that site because I know one of the trainers, which means that I have a fair amount of information about the site but it's pretty one-sided. So I know they have good trainers but I don't know what it's actually like to get training online from them or whether there are other sites that do the same thing. I won't say any more here, since I already sound too much like an advertisement for my taste, but if anyone is considering trying it out and has questions, you can ask me via pm (or comment, if you think there will be general interest).