Performance in anything (work or play) can be described as an equation of three factors - motivation + skill/knowledge + opportunity. And you have to have all three in some degree.
Motivation is having the drive or desire to do something... and when things are a little challenging or uncomfortable (like starting an exercise programme when we've been sedentary for a while) we need a pretty big bucket load of this stuff. But this isn't what this article is about! Likewise this article isn't about addressing the physical skills / knowledge required to get moving.
It's about creating the opportunity for exercise.