I run 1mi/day. On average, meaning that I don’t run every day.

I’ve done it for the past 5y. The first 2 were the hardest. This year I run over 500mi (and in Mar & Apr I practically didn’t run). This is just to say that the key is consistency, if you can make it a habit then it’ll stay a habit.

Run works for me, but bike or push ups might be an alternative if you hate running.

If you start from 0, account for your growth. For example if you can’t run 1mi now, don’t set your target to 1mi/day. Set it to 2mi/week or so. To give you a sense, when I run I typically do 5mi, so I only have to run twice a week to stick with my goal, and I can catch up if I fall behind.

This year I’m prob trying 10 pull ups/day, just for a change. (I’ll keep running oc)