Hello comrades and welcome to the third improvement megathread of January! 
- How is your year going so far?
- Did you start implementing any new habits or new year resolutions?
- How was your week?
- Do you have any goals for next week?
Poster: Palace of the Soviets - painting by Alexander Kotyagin [1938]
Good luck with your goals! 
Just please be careful with that and only use bodyweight for a while.
It can be really easy to injure yourself that way, especially if you're starting with a weak core.
Thanks for the advice. I've always neglected my core.
Look into hollow body holds, on top of being a good core exercise on their own, that position is incredibly stable and strong for your lower back and will translate to other skills and just generally injury prevention