Have been wanting to ask why is it that most users here their activity is different from their post count. For example you will see some user having the post count of 500 with activity of 125 why is it like that and what Is the course?
Let me simplify the math for you.
You can earn max 1 activity point daily. 1 written post brings 1 activity point, and everything is calculated for 14 days. So, a minimum of 14 posts in 14 days brings 14 activity points, while 14+ (22 for example) you will still get "only" +14 activity. This is where the difference arises in favour of the post count because many people write more than 14 posts bi-weekly.
There doesn't need to be one post per day, but the number of posts is counted within the 2 weekly calculations of activity.