Superb flexibility doesn't necessarily make you more injury-prone unless you also lack stability. A combination of great mobility and poor stability is a recipe for injury because it's harder to control your movement when you run or do any activity.
If you have Gumby-like flexibility, use it to your advantage by spending extra time working on the stability of your hips, torso, and shoulders—also known as your "pillar." Every workout should include moves for your pillar like bridges and planks. For a routine to strengthen you pillar, check out these workouts at http://www.coreperformance.com/pillar-strength/.
- Sue Falsone