I've had a restrictive eating disorder for the past few years and I think it's safe to say that I'm recovered. However, I also stopped exercising during recovery because I tore my LCL a while ago and overexercising was part of the disorder. Now I'm borderline underweight since I lost all my muscle and am just starting to get back into not sitting around all day. Here's what I'm doing to start!
Do some basic calisthenics as soon as I wake up, then play Dance Central for 15-30 mins every morning. It's a great way to get myself out of bed and I don't even have to change or go outside, which are barriers that enable my laziness in bad weather. When I need to take a break from working at home, I go through one or two dance routines from performances I've done in the past. Even if I don't do them properly it gets me off my ass and moving.
My city has a lot of nice running routes so I try to run at least once a week. Currently stuck at 2k, but I can see my endurance improving slowly. There's a hill right by my apartment so I can sprint home up it too. I don't have a car and the metro sucks so I walk nearly everywhere I need to go.
I turn daily movements into exercises. Need to stand on my toes to reach something on top of the fridge? I do a few calf raises before getting the item down. I do all my vacuuming/laundry folding/ironing to music so I can turn those movements into intentional dance moves that exercise my core, (a la Hip Hop Abs lmao)
Help people out whenever they're moving. I'm still sore from helping to lift furniture last week but I like it.
I've never had issues with eating too much junk food or anything and I haven't had soda in years. I let myself eat whatever tastes good but I never eat until I'm full. In addition, I buy a couple of different vegetables from the store every week so I HAVE to figure out what to cook with them before they go bad. Keeps my meals balanced! I eat meat once a week and when I do it is usually fried chicken, so that's like my junk treat of the week.
As for mental health, I make time to talk to someone not in grad school every day. Usually it's my parents or boyfriend on the phone, but it's helpful and prevents me from getting too anxious and perfectionistic about my work. I find it easy to make time for my hobbies because dancing is taken care of (see above), cooking helps me eat healthy, and reading fiction gives my mind a break from my work. I watch a couple of reality TV shows too and that's the perfect time to do relaxing things like face masks, painting my nails, and other beauty maintenance stuff.