I've never done yoga, so I don't know if and how it affects the toes, but I know how hard the going part can be in such things. I do weightlifting three times a week and quite often I've had some reason not to go. Maybe I didn't get enough sleep last night, or I had work to do that day, or a million other things. So instead of missing workouts, I structured other stuff around them. You could do the same. I don't mean actually shuffle your schedule, but just think about yoga as the main thing you're doing that day. Like you don't have to go to yoga after school, you just have some classes before the yoga. And after yoga time, there'll be some dinnermaking and grading and what not.