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Static vs. Dynamic Stretching
Static stretching before exercise has been oversold — the evidence shows it may reduce power output and doesn't reliably prevent injury. Dynamic stretching is the better pre-workout choice.
Static stretching is what most people learned in PE class: sit on the ground, reach toward your toes, hold for 30 seconds. Kathy’s example in the stretching episode was the sit-and-reach, which gave Jason another opportunity to mention his Highland View Middle School record.
Dynamic stretching involves movement through a range of motion — think butt kicks, leg swings, or walking lunges. The key difference is that dynamic stretching activates the tissues you’re about to use rather than holding them in an elongated position.
The myths Kathy debunked in one episode: (1) you should always stretch before exercise — only if it’s dynamic; static before a workout may reduce power output; (2) stretching prevents injuries — strength training does this better; (3) more flexibility equals better performance — elite sprinters typically have tight hamstrings, which helps them generate force. The bouncy ballistic stretch is in a third category: “good for business,” meaning it’s injury-prone enough to create PT patients.
What actually helps: dynamic warmup before exercise, strength training for injury prevention, and static stretching post-workout when tissues are warm and you’re not trying to generate force.
First seen in Static vs Dynamic Stretching: What the Evidence Really Says.