Compared to the days of the coronavirus pandemic a few years ago, customer activity in any pharmacy in the U.S. state of Virginia appears normal. Shelves are well stocked with medications, many of them marked with discounted prices. Yet despite this calm scene, there is growing anticipation of a major crisis in what are known as global supply chains—one that could turn this quiet picture upside down.

Social media is flooded with viral walking challenges: from the 'hot girl/guy walk' to all the number-based protocols that have you wondering if you're exercising or back in math class. There's also tai chi walking, backwards walking, Nordic walking, rucking — the list goes on. If you want to add some more focused activity to your fitness routine, how should you start?

Fitness experts share the 'green' and 'red flags' to consider when trying out a viral walking trend.