Isometric Exercises for Tendon Pain: What They Do and Don't Do

An isometric exercise is one where you push or hold without moving — like pressing into a wall.

Why people use them

Most exercises involve movement. You bend, straighten, lift, lower. An isometric is different — the muscle produces force while the joint stays in roughly the same position. Pressing your palms together is an isometric. So is holding halfway up a calf raise without moving.

⚠️ When to see a doctor in person

Get emergency care straight away if a limb suddenly becomes cold, pale, or numb — this needs urgent assessment, not a routine appointment.

• Get medical help the same day if you felt a sudden snap or pop and the limb gave way or can't take your weight, or if a joint is hot, red, swollen, or unusually painful to touch (a fever may or may not be there — it doesn't need to be present for this to be serious).
• Get urgent medical advice for new one-sided calf pain or swelling, especially after travel, surgery, illness or a period of not moving much — this doesn't need a fever to matter, and can be a sign of a blood clot. Call emergency services if calf symptoms come with chest pain, sudden breathlessness, collapse or coughing blood.
• Book an appointment if there's clear weakness rather than soreness, if pain or pins and needles travel down the limb, if there's a new lump or swelling, or if the pain hasn't shifted after about 12 weeks of sensible exercise.
• If tendon pain or swelling starts while you're taking a fluoroquinolone antibiotic (names ending in -floxacin), stop taking it, rest the area, and contact the prescriber immediately — don't wait for a routine appointment.
• Don't use an isometric hold to mask pain so you can push through a match, race or training session despite worsening symptoms — feeling less pain for a short time doesn't mean the tendon is ready for full-speed activity. If you have a heart or cardiovascular concern, avoid holding your breath during a hard effort; breathe normally throughout. And if you're not sure whether shoulder, hip or knee pain is actually coming from a tendon, treat that uncertainty as a reason to get it checked rather than assuming these exercises apply.

Tendon pain that grumbles with activity and settles with rest is the usual picture, not one of these.

Isometrics became popular for tendon pain for two reasons. First, they let you load a tendon without the up-and-down movement that often stings the most, so some people find them easier to tolerate than moving exercises, although this varies. Second, several studies suggested a held contraction could dull tendon pain for a while afterwards — sometimes long enough to train or play on.

Now the honest bit. When researchers pooled the trials, the effect was less impressive than the enthusiasm suggested. A systematic review and meta-analysis published in 2020 found that isometric exercise was not better than isotonic exercise (the ordinary moving kind) for long-standing tendon pain, either straight after treatment or over the following 12 weeks. For a freshly irritated rotator cuff, it was no more effective than ice in the short term. A more recent systematic review reached a similar conclusion: short-term help with pain, but no consistent long-term improvement in how the tendon works, and a lot of the underlying studies were low quality.

So what's the fair summary? Isometrics are a tool, not the treatment. They may ease pain for a short while in some people, and they let you keep loading a tendon when moving exercises hurt too much — though others notice little or no change. Longer-term improvement usually comes from gradually building strength and activity tolerance. Both of the reviews above land in the same place: use isometrics as part of a gradual loading programme, not instead of one.

Starter exercises

The general idea is the same wherever the tendon is: find a position where you can push hard-ish without pain getting sharp, hold it, and repeat — but the exact position and dose depend on which tendon is painful. One option is to start with 3 to 5 holds of 20 to 30 seconds at a moderate effort, resting about a minute between, once a day or before activity, then adjust based on comfort and how it feels the next day.

Achilles (back of the heel) — Rise onto your toes on both feet near a wall, shift most of your weight onto the sore side, and hold still. Come down slowly.

Knee tendon (below the kneecap) — Try a shallow wall sit at a comfortable angle. Stop if the pain becomes sharp or keeps increasing.

Elbow (tennis or golfer's elbow) — Hold a light weight or a full water bottle with your forearm resting on a table, wrist just off the edge, and hold the wrist still in a mid position against the weight.

Shoulder — Place your forearm against a wall and press gently without moving, matching the direction of the press to the movement you're trying to strengthen.

Aim for firm effort, not maximum. If the pain becomes sharp, reduce the effort or stop the hold, and try an easier position.

Progression note

Isometrics are a starting point, so plan to move past them. Once holds feel comfortable, add slow moving strength work — 3 seconds up, 3 seconds down, 3 sets of 10 to 15, every other day — and keep the isometrics for flare days or as a warm-up before activity. Judge each step by how the tendon feels 24 hours later: same or better means carry on, clearly worse means do less. Over time, most programmes progress towards a mix of moving and held strength exercises. Improvement often takes several weeks or longer, commonly in the range of 8 to 12 weeks.

Bottom line

Isometrics can take the edge off tendon pain and let you keep loading a tendon on days when movement hurts, which is genuinely useful. But the pooled evidence says they aren't better than ordinary moving exercise, so treat them as a way into a progressive strength programme rather than a substitute for one.