Isometric Exercises: When Holding Still Builds Real Strength
Isometric exercises are ones where a muscle works hard but the joint does not move: a plank, a wall sit, holding a split squat at the bottom, or pushing against a barbell that cannot move. They do build real strength, but mostly at or near the joint angle you hold. That makes them excellent for specific jobs: strengthening a weak point in a lift, training around a sore joint, building trunk stiffness, and adding useful work when equipment or time is limited. They are a poor replacement for lifting through a full range of motion if your goal is general strength and muscle. Used as a supplement, two or three holds a session, they earn their place.
Here is how they work, which kinds are worth doing, and how to fit them into a normal programme.
What makes isometrics different
Most lifting involves two kinds of muscle action: the muscle shortening as you lift (concentric) and lengthening under control as you lower (eccentric). In an isometric, it does neither. It produces force while staying the same length.
The key consequence is angle specificity. Strength gained from a hold transfers best to positions close to the one you held, and less to the rest of the movement. Hold a squat at parallel and you get stronger at parallel, with less carry-over to the top. This is well established in the training literature and is the main reason isometrics work best as a targeted tool.
The two types worth knowing
Yielding isometrics
You hold a load in place and resist it pulling you out of position: a wall sit, a plank, a dumbbell held at the bottom of a split squat, a dead hang from a bar. These are easy to learn, easy to measure by time, and good for building endurance and control in a position.
Overcoming isometrics
You push or pull as hard as you can against something that will not move. The classic version is a pin press or pin pull: set the barbell against the safety pins of a squat rack at your sticking point and drive into it for a few seconds. These allow very high effort and are used to strengthen weak points in big lifts. They demand more experience, because “maximal” effort against an immovable object is easy to get wrong.
Where isometrics genuinely help
- Sticking points. If your bench press always stalls a few centimetres off the chest, a pin press at that height targets it directly. Our post on pause squats covers a related idea for the bottom of the squat.
- Core and trunk. Planks, side planks and cable anti-rotation holds teach the trunk to resist movement, which is exactly what it does when you squat, carry or deadlift.
- Training around discomfort. Some people find a hold at a pain-free angle tolerable when full-range movement is not. Physiotherapists often use isometrics in tendon rehabilitation for this reason. If you are dealing with a diagnosed injury, follow your physio’s plan rather than improvising.
- Positional strength. Holding the bottom of a lunge or split squat builds confidence and stability in positions many people find shaky.
- Little time or kit. A wall sit and a plank need nothing. Useful on holiday or on a day the gym is out of reach.
Where they fall short
- Full-range strength. Because the gains are angle-specific, you would need holds at many angles to match what a full-range lift does in one set.
- Muscle growth. Holds can build muscle, but for most people, normal sets taken close to failure through a full range are the more efficient route.
- Progress tracking on overcoming holds. Without a force gauge, it is hard to know if you pushed harder this week than last.
How to programme them
| Goal | Type | Typical dose |
|---|---|---|
| Weak point in a lift | Overcoming (pin press, pin pull) | 3 to 5 holds of 3 to 6 seconds, near-maximal effort, full rest |
| Core stability | Yielding (plank, side plank, cable hold) | 2 to 4 holds of 20 to 45 seconds |
| Position and control | Yielding (split squat hold, wall sit) | 2 to 3 holds of 20 to 40 seconds |
| Training around a sore joint | Moderate-effort hold at a comfortable angle | As advised by your physio |
Put heavy overcoming holds early in the session, after the warm-up, when you are fresh. Put endurance holds at the end. Long planks are not a sign of a better core: once you can hold a good plank for about a minute, make it harder rather than longer. Our guide on how long to hold a plank explains how.
Breathing and blood pressure
The most important technique point: keep breathing. Hard holds tempt people to clamp their breath, which pushes blood pressure up sharply. Short, controlled breaths through the hold are safer and let you hold longer.
Isometric exercise has attracted research interest as a way to help lower resting blood pressure, including a large 2023 review published in the British Journal of Sports Medicine. That is promising, but it is not a substitute for medical treatment. If you have high blood pressure, a heart condition, are pregnant or are returning after a long break, check with your GP first before doing hard holds, and stop if you feel dizzy or develop a headache. The NHS guide to high blood pressure is a good starting point.
Three holds to start with
- Split squat hold. Lower into a split squat until the back knee is just above the floor. Hold 20 to 30 seconds each side, upright torso, front foot flat.
- Cable anti-rotation hold. Stand side-on to a cable at chest height, hold the handle at your chest, press it out to arm’s length and resist the pull for 20 to 30 seconds each side.
- Wall sit. Back against the wall, thighs roughly parallel, weight through the heels. More detail in our wall sit guide.
In the studio
The lower ground studio at The Highgate House has a squat rack with safety pins for overcoming holds and a cable station for anti-rotation work, so isometrics slot into a session without fuss. I use them most with clients who have a sticking point, a stiff joint or a trunk that leaks under load. You can see how a typical session runs on the personal trainer Highgate page, where prices are also listed. If you would like to know whether holds suit your situation, mention it when you get in touch about 1-1 training.
Questions we get asked
Can you build muscle with isometrics alone?
Some, yes. But full-range lifting is more efficient for most people. Treat holds as a supplement.
How long should an isometric hold last?
3 to 6 seconds for maximal pushes; 20 to 45 seconds for endurance holds. Longer is rarely better.
Are isometrics safe for bad knees?
Often they are better tolerated than moving exercises, but get any persistent knee pain assessed by a GP or physio first.
How often should I do them?
Two or three sessions a week, as part of your normal training, is plenty.
Book with The Highgate House
Ready to start training properly? Email us at [email protected] with the service and the day that suits you, and we will come back to you with times.
Visit The Highgate House · Private personal training
The Highgate House, Archway Road, Highgate, London N6.
