Fat Tuesday and 41 More Days

So it occurs to me that Lent starts tomorrow. And though I'm not very religious, I like the idea of using the opportunity to give something up/do something good. I would like it to be something that would make me healthier (something that isn't giving up sweets - let's be realistic here) or something that results in an improved social condition (volunteering or otherwise giving something). Any ideas? I'm am thinking of seriously curbing my screentime, doing something like the 100 push-up challenge (challenge being the key word for me), or something like giving up pre-made lunches, but I'm open to suggestions. Help!