Isometric exercises: holds and pushes, what the research found and a session of holds

An isometric exercise is one where a muscle works against a load and the joint doesn't move. Hold a plank, sit against a wall, press your hands into a doorframe: all isometric. This page is the category. It covers what counts, what the research found for strength and muscle size, examples you can do today, how long to hold, and a session of holds. It's about training, not rehab or any health condition.

The two best-known holds have their own pages: the wall sit for the legs and the plank for the front of the trunk.

What counts as isometric

A 2025 meta-analysis describes isometric resistance training as generating force without joint movement, where dynamic training produces force through a range of motion.¹

Within that, researchers separate two kinds. In a 2026 trial, pushing meant exerting force against a fixed lever, and holding meant keeping a set joint angle against resistance.² On this page's reading, the plank and the wall sit are holds: you stay in position under your own weight. Driving your palms together or a hand into a wall is a push. Which everyday exercise counts as which is this page's reading, not the trial's. Most exercises on lists like this one are holds.

What the research found

• Strength went up. The 2025 meta-analysis pooled 32 studies and 621 healthy adults aged 18 to 45. Isometric training improved combined isometric and isokinetic strength compared with no exercise (a standardized difference of 0.65) and compared with dynamic training (0.35). Isometric strength gains were greater than with dynamic training; isokinetic strength, which is tested while the joint moves, gained about the same. The authors say it could be considered a viable alternative or complement to dynamic training.¹
• Muscle length matters. A 2019 systematic review of 26 research outputs, all of training lasting at least three weeks, found isometric training at longer muscle lengths produced more muscle growth than equal volumes at shorter lengths (0.86% to 1.69% a week against 0.08% to 0.83%) and carried over more to dynamic performance. It also reported substantial gains in muscle growth and maximal force regardless of training intensity.³
• Growth was similar to moving training in one small trial. In 23 healthy, resistance-trained men and women, six weeks of twice-weekly knee extensions, one leg held at long muscle lengths and the other moved through its full range, grew the front of the thigh by similar amounts. The held leg may have had an edge near the hip end of the thigh, but the authors say the uncertainty rules out a firm conclusion.⁴
• Holding and pushing may differ. In a 2026 trial of 10 adults, with one leg assigned to pushing and the other to holding for 12 sessions over six weeks, both raised isometric strength and muscle thickness. Only the pushing leg raised concentric and eccentric strength, and the holding leg gained more thickness in the quadriceps overall. The authors call for larger samples, and ten people is small.²

Read together: holds build strength, most clearly the strength of holding, and they can grow muscle. Longer muscle lengths, such as a deeper wall sit, look like the better place to hold. None of this says holds beat lifting through a full range, and the two muscle-size trials here were on the quadriceps.

Isometric exercises to try

The starting amounts are practical, not from a trial.

The wall push is the one push here: nothing moves because the wall doesn't. Build the effort over a couple of seconds rather than slamming into it. The core workout has another hold, the Pallof press held out at arm's length.

How long to hold, and how hard

A 2019 narrative review, a summary of studies rather than a pooled analysis, gives ranges by goal. For muscle growth, it suggests contractions at 70% to 75% of maximum voluntary contraction, 3 to 30 seconds each, with more than 80 to 150 seconds of total contraction per session, over more than 36 sessions. For maximum strength, 80% to 100% of maximum, 1 to 5 seconds each, and 30 to 90 seconds of total contraction per session, at multiple joint angles or a targeted one. It also says isometric training has been shown to cause less fatigue than dynamic training.⁵

Those percentages are lab numbers: at home you can't measure a maximum contraction. The practical reading is the shape. For strength, short and very hard. For muscle, longer and still hard, ending each hold with a few seconds left and your position intact. The hold times in the table follow the second shape, because you can judge them without a gauge.

A session of holds

A practical session, not a protocol from a trial. It takes about 15 minutes and needs a wall and a floor.

1. Wall sit: 3 holds of 30 seconds.
2. Plank: 3 holds of 20 to 30 seconds.
3. Glute bridge: 3 holds of 30 seconds at the top.
4. Hollow body hold: 3 holds of 15 to 20 seconds.
5. Push-up, halfway down: 3 holds of 5 to 10 seconds.

Rest 45 to 60 seconds between holds and keep breathing steadily. When a hold gets easy, make it harder rather than longer: a deeper wall sit, a longer lever on the plank, one leg on the bridge.

Where holds fit in a week

As a practical start, two or three times a week works as a finisher after your main lifts, or on its own at home on a day you aren't lifting. Treat them as a complement; the 2025 authors say isometric training could be considered a viable alternative or complement.¹ A hold doesn't train the muscle through its full range, and the main lifts do. If you want to see how holds sit beside lifting in a week, how often to train covers the frequency side.

Common questions

Are isometric exercises enough to build strength?

They build strength, and the 32-study analysis found bigger gains in isometric strength than dynamic training gave, with similar gains in isokinetic strength.¹ Its authors say they could be considered a viable alternative or complement to dynamic training.

Do isometric exercises build muscle?

In the trials above, yes. The review's muscle-growth rates were larger at longer muscle lengths,³ and in 23 resistance-trained people, held and full-range training grew the quadriceps by similar amounts.⁴ The evidence is mostly on the legs, and some of it is small.

How long should I hold?

For the practical sessions on this page, 5 to 30 seconds in good position, depending on the exercise: 5 to 10 for the push-up and bird dog holds, 15 to 30 for the rest. The 2019 narrative review gives 3 to 30 seconds a contraction for muscle growth and 1 to 5 seconds for maximum strength.⁵

Should I check with a doctor before adding holds?

This page is about training strength with holds in healthy adults. Questions about blood pressure, pain, an injury or a medical condition belong with a doctor or a physical therapist.

If you'd rather have the week planned

Holds are easy to add and easy to forget. Coaching is the version where your workouts live in Trainerize, built around the days you actually have, and a weekly call looks at the week you just had and rebuilds the next one. How coaching works explains the rest, and apply is the first step. Otherwise: after your next session, do three wall sits of 30 seconds and write down the depth.