Alu, what an achievement! A 3.1 GPA.
And the weightloss :)
What about a bike? I started on one when I was 90 kg ( I think that is about 180 lb) and I am 5'4. I rode to work 3 times a week, as we only have one car. Lost 20 kg in 3 months. Still have to work at it, but it was less of an issue for me than the gym. I now ride a lot, and it helps keep it off. I also enjoy the time alone.
Enjoy your studies x