"""Zuckerberg insisted the goal was easily attainable. He took regular breaks throughout the day to do 10-15 pushups, even if he was in the middle of a meeting with visitors. He completed the 5,000."""

5000 push-ups, one week = 715/day assuming 7 day week. That means 48 breaks per day of 15 push-ups. So assuming 12 hour days, 4 breaks per hour.

So every 15 minutes he did 15 push-ups for a week?