91%
Avg fit score — top selections
2.5+
RSI threshold — elite level
40cm+
Typical elite CMJ height
<10%
Target bilateral asymmetry
Biomechanical Analysis
What your body
needs to excel.
Athlete Profile assesses the specific biomechanical traits that predict elite performance in Volleyball. These aren't generic fitness metrics — they're sport-specific physiological signatures.
Reactive Strength Index (RSI)
The jump-land-jump efficiency metric
RSI measures how efficiently your neuromuscular system absorbs eccentric loading and converts it to explosive concentric force. Elite volleyball players maintain RSI scores above 2.5, indicating superior stretch-shortening cycle (SSC) efficiency. This is your primary predictor of blocking height and transition jump performance.
Glenohumeral Kinetic Chain
Shoulder complex power transfer
The overhead arm swing and spike motion rely on sequenced activation from hip extension → thoracic rotation → scapular protraction → glenohumeral internal rotation. Disruption at any link reduces force transfer and elevates rotator cuff impingement risk — the #1 overuse injury in volleyball.
Ankle Plantar Flexor Stiffness
The spring in your vertical
Achilles tendon stiffness and triceps surae strength determine how much elastic energy is returned during ground contact. Higher tendon stiffness correlates with faster rate of force development (RFD) and superior jump heights — a key differentiator between recreational and competitive-level players.
Proprioceptive Acuity
Joint position sense under fatigue
Volleyball involves constant multi-directional landing and plant mechanics. High proprioceptive acuity in the ankle and knee complex reduces lateral ankle sprain incidence and ACL loading. Our single-leg balance assessment measures neuromuscular control under perturbation — the real-match condition.
What Athlete Profile Measures
Your Volleyball
assessment report.
Peak Power Output
Elite volleyballers generate 35–45 W/kg during CMJ. Your report benchmarks peak power against age- and sex-matched volleyball athletes from U14 to U21.
Anthropometric Fit Score
Arm span-to-height ratio, sitting height index, and hand span contribute to your positional fit profile. Centers trend mesomorphic-ectomorphic with high arm-to-torso ratios.
Bilateral Asymmetry Index
>15% force asymmetry between dominant and non-dominant limbs is a known ACL injury predictor. Athlete Profile flags this clinically and prescribes targeted corrective protocols.
Neuromuscular Fatigue Resistance
85% of match-deciding errors occur in the third set. Your RSI tested late in the protocol predicts your performance when neuromuscular fatigue accumulates.
Sample Volleyball Fit Report
What you'll receive after your assessment
Sport Fit Score
91%
Percentile-ranked against age + sex-matched athletes
Biomechanical Grade
A–F
Per-trait scoring across all 5 assessment dimensions
Injury Risk Flags
4 tracked
Sport-specific injury predictors with corrective roadmap
Volleyball-Specific Injury Predictors We Screen
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I'd played soccer for 6 years. Athlete Profile told me my RSI and reach profile were built for volleyball. 8 months later I'm starting libero on the varsity team.
Mia T.
Athlete · 15 years old