Deep Knee Bend / Lunge / Squat — Contraindicated Ballistic Stretch
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Historical reference: its only source is the original reference manual, and some of it may be out of date. Not used for AI answers until re-sourced.
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Bouncing or forcing into deep knee bends, lunges, or squats as a stretch is marked "X" in the source (said to strain the knee's lateral ligaments, compress the kneecap, and pinch cartilage). This is about ballistic end-range stretching, not controlled deep squats, which are safe for healthy knees.
Detail
The Deep Knee Bend/Lunge/Squat (with or without weights) is one of the contraindicated ("X-Rated") movements, illustrated in the source with a large "X" (a figure shown standing and in a deep-squat position with a barbell across the shoulders). Its specific risks are:
- Endangers the lateral ligaments of the knee
- Compresses the kneecap
- Pinches and damages the cartilage
Context matters: this is a stretching drill, where the risk comes from bouncing or forcing the end range with momentum. It is not a verdict on controlled deep squats in resistance training, which current evidence finds safe for healthy knees (see Squat Depth and Knee Safety (Deep Squats Are Not Inherently Dangerous)).
Key facts
- Source's original framing: endangers the lateral ligaments of the knee, compresses the kneecap, pinches and damages the cartilage.
- Applies with or without added weight.
- 2026 update: current research finds squat depth itself is not inherently dangerous for healthy knees with adequate mobility/technique — see Squat Depth and Knee Safety (Deep Squats Are Not Inherently Dangerous)'s currency note. The distinct concern here is more plausibly the ballistic/uncontrolled bouncing this X-Rated context implies, not depth per se.
Connections
- "X-Rated" Exercises (Contraindicated Stretches) — Overview — one of the eight "X-Rated" stretches.
- Squat Depth and Knee Safety (Deep Squats Are Not Inherently Dangerous) — controlled deep squats and knee safety (the distinction from this ballistic drill).
- Knee Safety in the Squat — squat technique and knee safety.
- Knee Joint Range of Motion — knee ROM (hinge joint).
- Knee–Toe Relationship Rule — knee alignment rule.
Sources
Topics like this depend on your health and history. A qualified coach or clinician can apply it to you safely.
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.