Jumping & Landing Mechanics

Jumping and landing sit at the exact intersection of athletic performance and injury prevention. The mechanics that make a landing efficient — absorbing force progressively through the ankle, knee, and hip — are largely the same mechanics associated with lower ACL loading in the biomechanics literature. This isn't two separate topics that happen to share a joint. It's one movement pattern with two different lenses on the same evidence.

That said, this page is about movement, technique, and evidence-based programming principles — not diagnosis, and not a guarantee that any specific drill or program will prevent an individual athlete's injury. The research below reports real risk reduction percentages from controlled trials, and we present them that way, with the honest caveats the evidence itself carries.

The Landing Error Scoring System (LESS) is a validated, video-based clinical screening tool for landing technique. It's scored from standard two-plane video — frontal and sagittal — of a drop-vertical jump, and it does not require force plates or 3D motion capture, which is exactly what makes it usable in a normal clinic setting rather than a research lab. A systematic review of its measurement properties found good-to-excellent reliability across studies. The original validation work, the JUMP-ACL study, established the LESS as a standardized way to score landing errors observationally.

Here's the honest limit on it: reliability is not the same claim as proven injury prediction. The same systematic review that confirmed the LESS's reliability also states plainly that its predictive value for actually forecasting future injury remains uncertain. We use the LESS as a way to objectively assess and improve landing technique — a structured way to see what's actually happening and track change over time — not as a diagnostic tool that predicts who will or won't get injured.

Plyometric training reliably improves jump height, power output, and reactive strength when it's dosed properly. A systematic review and meta-analysis on plyometric-jump training found significant effects with programs of at least 8 weeks, 2–3 sessions per week, 20–30 minute sessions, and 1–2 minutes of inter-set rest — real, usable programming parameters, not vague guidance.

Drop height and box height are commonly used to set intensity, but a critical systematic review found that box height alone is not the best determinant of training intensity — ground reaction force, power output, and jump height are better ways to program true intensity, and the review flagged persistent methodological weaknesses (poor individualization) across the drop-jump literature generally. One conservative progression example cited in that review: starting at a 15.24 cm (6 in) drop height and increasing by 15.24 cm every 3 weeks, up to 60.96 cm (24 in).

Sequencing matters too. The integrative neuromuscular training (INT) model — an expert-consensus framework, not a level-1 randomized-trial finding — names dynamic stability (lower-limb and core), strength, plyometrics, coordination, speed and agility, and fatigue resistance as the components, with fundamental movement-skill competency established before sport-specific or higher-load work. In practice: landing-technique and neuromuscular-control work comes before or alongside higher-intensity plyometric loading, not after it. And progression is broadly bilateral-before-unilateral, with ground-contact-time targets progressively shortened — roughly 1–2 seconds down to 0.25–0.4 seconds — as athletes advance toward reactive, sport-representative demands.