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@BringMeMyFix
If you want to work on force production ('leg muscles'), a turbo with a geared bike gives you the most options, though you'd usually be best off nipping outside, whatever the weather, finding a quiet street, and doing some neuromuscular work (seated big geared surges, etc.).
I've got rollers with a magnetic resistance unit, and I can do 10/20/30 minute intervals which hurt my legs. I spent a lot of time using 81", and that's enough to build muscular endurance. But if you want to add muscle mass to your legs, you're going to need to eat more and do some weights; and be sure that you really do want to add lean mass to your body.