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Resistance Training
Quantified.

Track bar path, rep tempo, and force-velocity profiles in real time. The ForjCore turns any weight stack into a lab-grade strength analysis tool — supporting velocity-based training (VBT), 1RM estimation, and fatigue monitoring.

Measure My First Workout See How It Works
ForjCore sensor that clips onto a weight-stack pin to measure force, velocity, and range of motion
Dashboard
Sessions
Analytics
Insights
Athletes
Velocity Insights — Last 8 Sessions
Peak Velocity
0.84 m/s
Force Output
+12%
Symmetry
96%
ROM
Full
Definition

What is ForjCore?

ForjCore is a resistance-training sensor from FORJ that clips onto a standard weight-stack pin and measures force, velocity, and range of motion for every rep. Data streams over Bluetooth to the FORJ app so you can run velocity-based training (VBT), estimate 1RM, and monitor fatigue on the gym floor instead of in a lab.

Traditional gym logs record load and reps. ForjCore adds live kinematics — bar path on the stack, rep tempo, power, time under tension, and left-right limb symmetry — so coaches and clinicians can make programming decisions from measured output, not guesswork.

Last updated: 25 August 2026

Platform Features

Everything you need,
nothing you don't

Built for serious athletes and practitioners who demand accuracy.

Real-Time Velocity & Force Telemetry

Force, velocity, bar path, rep tempo, and range of motion streamed live with zero lag — supporting VBT protocols and load-velocity profiling.

AI Performance Analysis

Our engine identifies patterns, flags imbalances, and delivers actionable recommendations after every session.

Progress Tracking

Session-over-session trend analysis showing exactly how your strength and form evolve over time.

Limb Symmetry Index

Bilateral comparison data that catches asymmetries before they become injuries — critical for training, rehabilitation, and performance.

Universal Compatibility

Attaches to any standard weight stack pin. One device, any gym, any exercise.

Professional Dashboard

Practitioners get a dedicated web dashboard to manage clients, assign programs, and review client data remotely.

For Health and Sport Professionals

Objective data for better training and rehabilitation decisions

Take the guesswork out of training and rehabilitation. FORJ gives your practice the measurement tools previously found only in research labs — at gym-floor pricing.

  • Monitor client progress objectively between sessions
  • Evidence-based exercise prescriptions backed by real data
  • Improve client adherence with visible, measurable progress
  • Detailed reporting for professional documentation
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Client Progress — Week 6
Right Quad — Peak Force 87%
Left Quad — Peak Force 71%
Limb Symmetry Index 82%
ROM — Full Flex 94%
Professional Insight

Left quad force deficit at 71% — recommend additional eccentric loading before return-to-sport clearance.

For Strength & Conditioning Coaches

Data-driven decisions for your athletes

FORJ is built for strength and conditioning coaches who want objective data on every rep — velocity-based training, fatigue tracking, load monitoring, and return-to-play decisions, all from one compact device.

  • Monitor training load and bar path across entire squads in real time
  • Track velocity loss profiles to manage fatigue and optimize recovery
  • Evaluate jump squats, countermovement jumps, and isometric mid-thigh pull tests
  • Build load-velocity profiles for individualised strength programming
  • Compare left-right asymmetry with Limb Symmetry Index for injury risk profiling
  • Deliver measurable progress reports to athletes and support staff
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Squad Load Monitoring — Week 3
Athlete 1 — Peak Velocity 98%
Athlete 2 — Peak Velocity 94%
Athlete 3 — Peak Velocity 87%
Squad Avg — Rep Tempo Consistent
Coaching Insight

Athlete 3 shows reduced peak velocity at 87% — recommend deload session or switch to accommodating resistance before heavy loading week.

Pricing

Simple, transparent pricing

No lock-in. Cancel anytime.

Individual
$5
per week

For gym-goers and athletes serious about tracking their training objectively.

  • Full ForjCore app access
  • Real-time force, velocity & ROM
  • AI-powered training insights
  • Session history & trend analytics
  • Personal progress dashboard
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Most Popular
Professional
$30
per week, per organisation

For coaches, exercise physiologists, strength and conditioning professionals, physiotherapists, and allied health practitioners.

  • Everything in Individual
  • Professional web dashboard
  • Multi-client management
  • Client progress reporting
  • Remote session monitoring
  • Program assignment & tracking
Start a Professional Account
How It Works

How ForjCore works

Using ForjCore takes four steps: attach the sensor to a weight-stack pin, train as usual, view live force and velocity in the FORJ app, then adjust load and volume from that data. No gym-machine retrofit is required.

Step 01

Attach ForjCore

Clip our sensor to any weight stack pin. No setup required — pairs instantly via Bluetooth.

Step 02

Train Normally

Perform your workout as usual. ForjCore captures every rep automatically in real time.

Step 03

View Analytics

See force output, velocity, ROM, and limb symmetry live in the FORJ app as you work.

Step 04

Optimize Training

Use AI-powered insights to fix imbalances, break plateaus, and improve results faster.

Compare

ForjCore vs typical gym tracking

Typical gym tracking records the load on the stack and how many reps you completed. ForjCore records how that load moved — velocity, range of motion, tempo, force, and symmetry — so velocity-based training and rehab decisions can use the same device.

What you get from a conventional workout log versus ForjCore on a weight-stack machine.
Criteria Typical gym tracking ForjCore
What you record Weight and reps Force, velocity, ROM, tempo, power, and limb symmetry
When you see it After the set, if you log it Live during the rep, then stored as session history
Velocity-based training Manual guess or a separate linear encoder Built in on pin-loaded stack machines
Gym compatibility Any gym, any logbook Any standard weight-stack pin; not a barbell encoder
Best for Volume logging Objective strength, coaching, and rehabilitation decisions
Our Story

Built by engineers who train

We are 3 engineers who saw a serious gap in the market for accurate resistance training data. Inspired by how smartwatches transformed cardio, we built ForjCore to do the same for strength training.

Read Our Full Story
FAQ

Frequently asked questions

ForjCore is a resistance-training sensor from FORJ that clips onto a standard weight-stack pin and measures force, velocity, and range of motion for every rep. Data streams over Bluetooth to the FORJ app so athletes, coaches, and clinicians can run velocity-based training, estimate 1RM, and monitor fatigue without a lab.
Velocity-based training is a method of prescribing resistance-training intensity using movement velocity rather than a fixed percentage of one-rep max. Coaches use mean or peak concentric velocity to auto-regulate load, end a set when velocity drops, and build load-velocity profiles. ForjCore captures that velocity on stack-loaded exercises in real time.
Clip ForjCore onto the pin of a weight stack, open the FORJ app, and train as usual. The sensor pairs over Bluetooth and records each rep automatically. The app shows live force, velocity, range of motion, and limb symmetry, then stores session history for trend analysis. No machine retrofit is required.
ForjCore attaches to a standard weight-stack pin, so it works on selectorised stack machines that use that pin format. It is not a bar-mounted linear encoder and is not designed for free-weight barbells. If your gym's pin-loaded machines use a conventional stack pin, you can move ForjCore between them.
FORJ is for athletes, gym-goers, strength and conditioning coaches, physiotherapists, exercise physiologists, and allied health practitioners who need objective resistance-training data. Individuals track force, velocity, and ROM across sessions. Professionals use the dashboard to manage clients, assign programs, and review progress remotely.
FORJ Individual is $5 AUD per week and includes the ForjCore app with real-time force, velocity, and ROM plus session analytics. Professional is $30 AUD per week per organisation and adds the web dashboard, multi-client management, reporting, and remote session monitoring. There is no lock-in; you can cancel anytime. See FORJ pricing for the full comparison.
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