One thing to keep in mind for running, along with all of the other suggestions you’ve gotten, is good posture and a strong core. Good posture during running will maximize the power of the muscles responsible for running, and it also opens up the diaphragm and makes breathing easier (important for running!).
So, that being said, you want to keep your entire core and body strong, Make sure to strengthen lower body muscles and address things like weak hamstrings or glutes, or tight hip flexors. For upper body be aware of tight chest muscles and weak back muscles.
Good luck and have fun!