Here are the hashtags I suggest for this Facebook post, along with brief explanations:
The mix of hashtags covers the key themes from the post - running in general, the 5K/beach/sunrise run details, the mental and physical health benefits, the fitness journey, and inspiring others to start. It includes a range of broad (#Running, #HealthyLifestyle), niche (#RunnersOfFacebook), and specific (#5KRun, #SunriseRun) tags.
Popular motivational tags like #RunningMotivation will help the post reach more runners looking for inspiration. Tags emphasizing the mental health and beginner aspects can expand reach to interested audiences. And the Facebook-specific #RunnersOfFacebook connects directly to the target platform.
Using these hashtags should help this post connect with the running community and beyond on Facebook, increasing its visibility, engagement, and inspiration impact. The variety of relevant tags expands potential reach while staying focused on the post's core running message.