CMJ Jump Height
32.6 cm (12.8″)
▲ +4.0 cm over 15 mo (+14.0%)
Above Avg Improved every session
Across 4 force-plate sessions over 15 months (Feb '25 → Jul '25 → Feb '26 → May '26), Rosie has shown a clear, stepwise improvement in bilateral jumping power while simultaneously adding +7.1 kg of bodyweight through normal teen development. The 19 May 2026 session was her most comprehensive battery yet, including CMJ, CMRJ, Squat Jump, Loaded Squat Jump, Abalakov CMJ (arm swing), Single-Leg Jump, and Single-Leg Hop & Return.
What's working — bilateral output continues to climb:
What needs work — bilateral asymmetry is the persistent gap:
Bottom line for coaching staff: The bilateral power story is genuinely good — she is getting stronger as she grows. But the asymmetry has been visible for 15 months and isn't self-correcting. A 6-week targeted unilateral block before next season is the highest-leverage intervention available right now.
Δ values on each card are vs the immediately prior session. Cumulative deltas vs Feb '25 baseline shown in chart badges below.
One line per metric, one dot per session, oldest on the left. Net % is from baseline to current. Trend coloring: green = moving the right direction, red = moving against, gray = essentially flat.
Counter-movement jump headline metrics across all 4 sessions. Higher is better for jump, power, and RSI; contraction time is the one where lower = faster.
Magnitude of % asymmetry between left and right legs across all four sessions. Shaded green band is the <10% target zone. Both indices have been outside the safe zone in 3 of 4 sessions.
% asymmetry between left and right legs. The shaded green band is the <10% safe zone. This is Rosie's most persistent gap — magnitude varies session-to-session but the average is well above target.
Read: Both indices show volatile session-to-session readings with no durable downward trend. The Feb 2026 landing-asym spike to 44% paired with the May 2026 takeoff-asym climb to 18.7% suggests a movement-pattern asymmetry that intensifies under load — not a simple "weaker side" problem that progressive strengthening would solve. This is the highest-priority intervention target.
Best-trial single-leg jump metrics across all four sessions. The bilateral CMJ has improved by 14% over 15 months; the single-leg numbers tell a very different story.
SLJ values are the best of left and right (best-trial). Single-leg power dipped during the July growth period and is now back near baseline.
Read: The bilateral-vs-unilateral split is the diagnostic. Bilateral jump is up 14%, but single-leg jump is only just back to baseline (15 months later). She is generating more total force, but the relative contribution between sides is widening — exactly the pattern that the Section 4 asymmetry charts also show. The two findings reinforce each other.
Tests added to this session for the first time. No comparison points available; useful as a current-snapshot of her jump profile.
| Test | Jump Height | Peak Power /BM | Notes |
|---|---|---|---|
| SJ · Squat Jump (no countermovement) | 25.8 cm | 43.7 W/kg | Concentric-only output baseline |
| CMJ · Counter-Movement Jump | 32.6 cm | 48.5 W/kg | +6.8 cm over SJ — healthy SSC contribution |
| ABCMJ · Abalakov (with arm swing) | 35.0 cm | 52.5 W/kg | +2.4 cm over CMJ — uses upper-body well |
| LSJ · Loaded Squat Jump (~7 kg) | 23.2 cm | 39.3 W/kg | −2.6 cm vs SJ under load — moderate load tolerance |
| SLJ · Single-Leg Jump (best of L/R) | 16.5 cm | 30.3 W/kg | Bilateral-to-unilateral drop is large (see Section 5) |
| Priority | Block | Sample Modalities | Re-Test KPI |
|---|---|---|---|
| 1 | Unilateral strength & landing mechanics — the persistent gap | Rear-foot elevated split squat 2× wk; single-leg RDL; step-down landings (3-sec eccentric); drop-and-stick from 20 cm box; mirror work for movement-pattern symmetry | Peak landing force asym < 15% |
| 2 | Unilateral power expression | Single-leg pogo hops, single-leg broad jumps, lateral bounds, ice-skater jumps; reps biased to weaker side | SLJ jump height ≥ 18 cm on each side |
| 3 | Maintain bilateral power ceiling (it's working) | Keep current CMJ/CMRJ-style plyometric work in the program — it has produced steady gains | Hold CMJ ≥ 32 cm; RSI-Mod ≥ 0.50 |
| 4 | Speed of contraction | Contraction time has been creeping up (708 → 824 ms over 15 mo) — add jumps with intent cue "be fast off the ground"; depth jumps from 15–20 cm box | Contraction time < 700 ms |
| 5 | Build SLHAR baseline metrics | Repeat SLHAR next session with more trials per side to capture reliable single-leg reactive data | Establish RSI per leg with n ≥ 3 trials/side |
| Window | Battery | Decision Threshold |
|---|---|---|
| 6 weeks (≈ 1 Jul 2026) | CMJ + SLJ + SLHAR — focused asymmetry check | SLJ asym ≤ 15%; landing force asym ≤ 20% |
| 12 weeks (≈ 12 Aug 2026) | Full battery (repeat 19 May tests) | SLJ ≥ 18 cm each side; landing asym ≤ 15%; CMJ ≥ 33 cm |
| Pre-season (Aug/Sep 2026) | Full battery + capacity work | Status report for coaching staff |
All values pulled directly from the VALD ForceDecks API on 22 May 2026. Sessions: 8 Feb 2025 (baseline screening, expanded battery), 14 Jul 2025, 6 Feb 2026 (both 4-test batteries), 19 May 2026 (7-test full battery). Best-trial values shown unless noted; asymmetry values are reported as magnitudes (sign convention varies session-to-session; what matters is the gap). RSI-Modified is scaled to the standard 0–1 range. Reference ranges drawn from youth female soccer normative data and Catalyst's own athlete pool. Goalkeeper-specific data not applicable; Rosie is an outfield/field-position athlete.