Today, I did a lot of research and found some exercises that looked doable on paper. Even though I didn't get much sleep, I wanted to exercise, so I decided to try some of them.
I'm definitely not ready for Isometrics. The only thing I can hold for a considerably amount of time is a squat, maybe lunges. I tried with a regular plank, close grip plank, side plan and reverse plank. Sadly, I can only last around 10 or 15 seconds on those, 20 if I'm lucky.
Also tried other exercises, such as:
Squat thrusts: I could do 10, without jumps. But I had to take some breaks.
Bicicle kicks: I can't do them. Not because they are tiresome, but because I can get on a position that will actually make me work.
Static squat + punches (with dumbbells): This one is doable. I could last almost 30 seconds the first time, and 20 the second time I did it.
Mountain climbers: Didn't really tried those since I was getting tired at this point. I know from experience that I can do some of them, so I'm gonna be using these.
Bear crawl: There is no way I can do this one. The only time I think* I got the form right, I couldn't even move.