Nice! You're lucky that you have affordable options in your area, as this type of treatment can get very expensive!!

About the 50 calorie burn per pound of muscle - sadly, I think that's a fitness myth. Although it's very widely believed and we hear that figure thrown out all the time, I think it's actually a lot less than that - more like 10 calories maximum per pound of muscle. Pound for pound, muscle DOES require more calories to sustain it than fat though, for example, so it's still a good incentive to gain some! And yes, you do need to keep exercising to maintain the muscle mass like you said :)

Hiking can be great exercise, and put a good amount of stress on your legs - whether or not you consider it to be a leg day is sort of personal, based on your goals and the rest of your program. But I'd say it definitely counts toward working your legs, if you're sweating and tired afterward!! :)

Great questions!! Thanks so much for asking and for your support!