Honestly, I am one of those people, and sit in front of a PC all day everyday, and I feel as if my health is going down every single day because of it. It's fine though, I do not think that I will continue to do this forever, I am going to probably do something else. I get that it may not be all that insane to deal with this right now, because while having a financially depressing period, taking care of your health, even mentally, is not that easy.
When you are mentally not doing fine, then you are not going to be doing that well on your body neither. I am pretty sure that we are going to end up with something that will take care of your problems, we are not going to end up with a much better result at the end of the day.
You need to move somehow and get that sweat out of your body. Your body needs to at least have some activity for it to shed some pounds and remove the toxins in our body. That's why if you're thinking of doing something else, have some physical activities and start the initiative of it. It's hard at first but you have to do it if you love yourself. It's much worse if you'll not take any actions and you'll just have to pay a visit in the hospital, you don't want to do that and so do it while it's still early. Even if you're mentally fine, your thinking will change if your not mostly doing any activity whole day.
Yes, it is true that physical activity needs to be done to maintain fitness which is of course for health, because with a healthy body, all activities carried out will be much better, I think health is number one to prioritize, because in doing physical activities, mental health will also be carried away, there must be a solution to think about in living a better life.