---
id:"kb-2026-00420"
title:"Stretching and Flexibility"
schema_type:"TechArticle"
category:"health"
language:"en"
confidence:"high"
last_verified:"2026-05-22"
generation_method:"ai_assisted"
ai_models:["claude-opus"]
derived_from_human_seed:true
primary_sources:
  - title:"Stretching Scientifically (Thomas Kurz, 4th Ed)"
    type:"book"
    year:2003
    url:"https://www.stadion.com/stretching-scientifically-book/"
    institution:"Stadion Publishing"
secondary_sources:
  - title: "MDN Web Docs — HTTP"
    type: "documentation"
    year: 2026
    url: "https://developer.mozilla.org/en-US/docs/Web/HTTP"
    institution: "Mozilla"
completeness: 0.88
ai_citations:
  last_citation_check:"2026-05-22"
---

## TL;DR

Stretching improves range of motion, reduces injury risk, and relieves muscle tension. Types: static (hold stretch 15-60s), dynamic (controlled movement), PNF (contract-relax). Dynamic stretching before exercise; static stretching after. Flexibility decreases with age; regular stretching maintains it.

## Core Explanation

Hamstrings, hip flexors, shoulders — tightest in sedentary populations. Static stretching before exercise may temporarily reduce strength — dynamic is better for warmup. Yin yoga: long-held (3-5 min) passive stretches targeting connective tissue. Foam rolling: self-myofascial release. 'Motion is lotion' — movement lubricates joints.

## Further Reading

- [Stretching Scientifically (Thomas Kurz, 4th Ed)](https://www.stadion.com/stretching-scientifically-book/)