Got dayumn I missed running, running ****s GTFIH

Is there any stretches or exercises I can do to target the abdominal muscles in a way that'll benefit running? After not running for 5 years started back up and the ab doms are crazy(not cramps or stitches).
Mile time is dropping fast every run now which I'm happy about.
My knee is handling it really well, I'm super happy about that. Think the shoes make a huge difference for the knee and allows me to run(Brooks Glycerin 17).

Also do you guys still run outside in the winter? Do you wear trail shoes if you do for the snow?
85 pounds Lost
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Silverback1996 "We all start some where brah, even the girthiest, veiniest, tree trunk of a cawk started out as just a sperm and an egg brah"