For years, runners have been told to follow the 10 percent rule: don’t increase your weekly mileage by more than 10 percent, or you’ll end up injured. It’s been repeated by coaches, built into training plans, and even embedded into algorithms on GPS running watches. But new research is calling that advice into question, and ... Read more The post The 10% Rule: New Study Suggests We’ve Been Doing It Wrong This Whole Time appeared first on Marathon Handbook.