Strength percentile
412.6DOTS
Top 21% · Male · 82.5 kg
The Lab · Strength
LIFT
HEAVY.
Every set scored against your history and international strength standards.
72.4
Strength Index
The Engine · Cardio
RUN
FAR.
Pace, heart rate and splits fused into one honest endurance score.
69.1
Running Index
DOTS 412.6Top 21% worldwideEF +9.4%90-day efficiency2.3× BWDeadlift ratioNegative splitLast 5K verified+31 pts8-session climbDecoupling 3.1%Aerobic health
Live analytics
Data that actually means something
Pace & heart rate
4:42/km
Avg HR 158 · EF 0.84
Session delta
+31pts
8 sessions · Squat trend
HR zones
Z2dominant
68% aerobic · 22% threshold
The product
One logbook.
Two engines.
Gym sessions and cardio runs live in the same timeline — each scored in its own language, unified into your Split Index.
- Per-exercise strength scores on every set
- Pace, HR and splits fused for endurance
- Filter The Lab vs The Engine instantly
splitindex.co.uk/dashboard
The Lab
72.4
The Engine
69.1
Logbook
Push Day
5K Run
Pull Day
Pricing
Start free. Upgrade when you're hooked.
See how lifting and running actually affect each other
Not a strength score and a cardio score side by side — real analysis, mined from your own paired history, of whether leg day is hurting your next run and vice versa. Nobody else has both halves of your training on one timeline.
Know when to back off
Your Injury Risk Index tracks ACWR against your own training baseline, so a load spike shows up before it becomes an injury — not after.
Know what you're capable of
Race predictions built on Riegel's formula, personalized to your own pace curve across distances — not a generic, one-size-fits-all exponent.
Prove it
DOTS, IPF GL, and published age-graded standards — evidence-based benchmarks you can defend, not an arbitrary points system.
Free
£0/mo
- ✓Full workout logging (all paths)
- ✓Current Split Index & per-workout cardio index
- ✓Last 7 days on dashboard
- ✓Rules-based training snippet
- ✓Manual entry + CSV import
- ✓Country leaderboard preview
Premium
Best value: annual£29.99/yr
£5/mo billed monthly — just £2.50/mo
- ✓Injury Risk Index — know when to back off, before it becomes an injury
- ✓GPT AI Coach — a concrete recommendation after every workout
- ✓Race predictions personalized to your own pace curve, not a generic formula
- ✓Full Strength Index with DOTS / IPF GL tiers
- ✓Cardio HR accountability (TRIMP, EF, decoupling)
- ✓90-day trend history & period comparison
- ✓8-week Split Index projections
- ✓Global leaderboards & rank percentile
- ✓Data export (CSV / JSON)
Also available monthly (£5/mo) or lifetime (£79.99, one-time) after signup.
Scores are estimates for training insight only — not medical advice.
The Lab
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The Engine
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