If you leave the body empty and put a future date ("Spring 2020") that should capture your intention. Alternatively, in your interests you could list that field of law and mention you are joining XYZ to learn more about it.
Yes, the only other commitments I would have are my extracurricular activities which add up to around 11 hours a week. I think I can put in 40 hours per week, 6-7 hours per day.
You can definitely explain somewhere in the application--maybe for a short answer question-- that because you had this circumstance--a health issue, you had to limit activities. This may help explain the college activities question.