Great simple advice. Nike sums it up even shorter with "Just do it." And if you read between the lines, it says "Don't think." I'm not saying don't think at all of course, but one of the biggest things that keeps someone from getting started is overthinking. Overthinking what's needed, how much, how hard, what will happen if this, or that, when's the right time, what if it's a waste of time, and on and on.
Their second piece of advice that they infer in the article is the best way to learn is by doing. Because that's another big obstacle to starting, believing one is not prepared to get something done, and that the person just needs to learn a bit of knowledge before he or she gets started. Just start and learn along the way. How else did we learn how to walk when we were babies?