Walk into Intension Chelsea and the first thing you notice is the studio: 14 machines, set out in clean, ordered lines, waiting: the Tensionformer.
This guide explains what a Tensionformer is, how it works, and why we chose every detail with an instructor's eye.
The Tensionformer, in brief
The Tensionformer is a spring-loaded sliding carriage trainer. You work against a moving carriage that is connected to a set of springs, alongside cables, a foot bungee, poles and dumbbells. Push, pull, press or hold, and the springs resist you through the whole range of the movement.
It is built to our specification, and it exists for one purpose: to deliver the Tension Method.
How a carriage machine works
At the heart of the Tensionformer is the carriage, a padded platform that glides along a frame. Springs attach the carriage to the frame. Each spring adds resistance, and different combinations change how hard every movement feels.
Because the springs resist you continuously, there is no point in the movement where the muscle can switch off. That is what makes the machine so well suited to slow resistance training. Every inch, out and back, is work.
Instructors adjust the springs between exercises, and sometimes within them, to keep each muscle group at the right level of challenge.
What the Tensionformer brings together
Springs
The spring set was chosen by carefully mapping resistance combinations. The result is a wide resistance range, from fine low-end steps to serious load, so beginners and smaller muscle groups can progress in small, precise increments while stronger members always have somewhere to go.
Cables
The Tensionformer uses cables rather than rope. They give a smooth, consistent line of pull for upper body and core work.
Foot bungee
The foot bungee adds another source of resistance for lower body and core exercises, opening up movements that springs and cables alone cannot reach.
Poles
Poles offer support and leverage in certain positions, helping you hold alignment while the muscle does the work.
Dumbbells
When the springs alone are not enough, dumbbells from 5kg to 12.5kg are added. They increase the difficulty and help take each muscle to full failure.
The details that matter
No shoulder supports
The carriage has no shoulder supports. It was a deliberate choice, made for comfort and for range: without them, you can take side grips during planks and move more freely across a wider variety of positions.
Handles where your hands need them
Handles are fixed on both sides and at one end of the machine, giving a comfortable, secure grip, which matters when you are holding a position for a long time under load.
A considered finish
The straps are brown and cream to match the Intension palette, set against a black carriage deck. Small details, but the studio is meant to feel cohesive, calm and considered from the moment you walk in.
Built with instructors, for teaching
Every decision on the Tensionformer was made from a teaching point of view. It was specified with our lead instructor and a group of advisers, including three highly experienced UK slow resistance and strength instructors.
Their questions were practical. Which carriage gives members the most comfortable, versatile base? Which resistance range lets an instructor coach a complete beginner and a seasoned athlete in the same class? Which grips stay comfortable through a long hold? The answers shaped the machine you will train on.
Developed alongside the Tension Method
The Tensionformer and the Tension Method were developed together. The exercises, their sequencing and their resistance levels were all built around this machine. That is why the Method feels as it does: slow, prolonged and precise, with each muscle working until it can work no more.
The Tensionformer in a class
A Tension Method class lasts 50 minutes and is capped at 14 people, one per machine. Your instructor leads the session, calls the spring changes and progressions, and adjusts the workout to you, so the class is personalised even though you train as a group.
For your first class, arrive 5-10 minutes early so your instructor can introduce you to the machine.
Frequently asked questions
Is the Tensionformer a Pilates reformer?
No. A Pilates reformer is built for Pilates, which centres on control, stretch and mobility. The Tensionformer is a strength training machine, specified by Intension for the Tension Method and geared to your strength, fatigue and cardiovascular limits. For more detail, read our comparison of the two.
Do I need experience to use a Tensionformer?
No. Resistance can start very light and build gradually, and your instructor will guide every adjustment. Complete beginners and experienced members can train in the same class.
What equipment is used alongside the carriage?
The Tensionformer combines springs, cables, a foot bungee, poles and dumbbells from 5kg to 12.5kg. Your instructor will introduce each element as the class progresses.
Where can I try a Tensionformer?
You can train on the Tensionformer at Intension Chelsea, 6 Burnsall Street, just off the King's Road. Create an account and enjoy our soft launch £10 per class offer during December.
Book your first class
The best way to understand the Tensionformer is to train on it. Sign up for your Intension account and book your first class at Intension Chelsea. During our soft launch, classes are just £10.