Tendinopathy Rehab — Exercise Progression & Program

Learn why progressive loading exercise is the main treatment for tendinopathy, how the four rehab stages work, how much pain is acceptable, and what a real program looks like.

📎 Knee pain (jumper's knee)? See the dedicated program → Patellar Tendinopathy: 12-Week Rehab Program

What is tendinopathy and why is exercise the treatment?

Tendinopathy is pain and structural change in a tendon caused by loading it beyond what it can currently handle. Common sites include the Achilles tendon, the patellar tendon (“jumper’s knee”), the elbow (“tennis elbow”), and the rotator cuff in the shoulder.

• It used to be called “tendinitis,” but the main problem is not the classic red-hot-swollen kind of inflammation. It is failed healing and disorganised tendon tissue from repeated overload — some inflammatory cells and signalling molecules are involved, but they are not the whole story. Hence the modern name, tendinopathy.
• Because it is not simply inflammation, rest and anti-inflammatory pills alone usually don’t fix it.
• Tendons work like muscles: use it or lose it. Complete rest actually makes the tendon weaker, so the pain often comes right back when you return to activity.
• Progressive loading — stressing the tendon in a planned, step-by-step way — has the strongest evidence of any treatment. The exercise itself is the medicine.

The four stages of rehab

Tendon rehab is like climbing stairs, one step at a time. You move up based on symptoms and strength — not on how many weeks have passed.

(A note on the evidence: this four-stage framework is standard clinical practice and each individual stage is evidence-supported, but the staged sequence itself has not been validated by a direct randomised trial.)

Progress by strength and symptoms, not by the calendar — own each step before climbing to the next.

Stage 1: Isometric holds

• “Isometric” means the muscle works hard but the joint doesn’t move — for example, holding a half calf raise perfectly still.
• Typical dose: fairly heavy holds of 30–45 seconds, 5 repetitions, once or twice a day.
• Early studies suggested isometrics give extra pain relief; later studies were mixed. Don’t expect a magic painkiller — think of it as the gentlest way to start loading.
• Best for the early, more painful phase when normal training isn’t tolerable yet.

Stage 2: Isotonic strength / heavy slow resistance (HSR)

• This is the main course of rehab: slow, weighted movements that rebuild the tendon’s capacity.
• Keep the tempo slow — 3 seconds up, 3 seconds down — about 3–4 sessions per week, gradually adding weight.
• Eccentric-only exercise (lowering-phase only, e.g. Alfredson heel drops) and HSR produce similar results; HSR is often more comfortable and easier to stick with.

Stage 3: Energy-storage / plyometric training

• Hopping, jumping, skipping, and sprint drills — movements where the tendon stretches and recoils like a spring.
• Enter this stage once strength is close to equal on both sides and pain is stable.
• If your sport involves running or jumping, this stage cannot be skipped — skipping it is a common reason for relapse.

Stage 4: Graded return to sport

• Start with short, low-intensity sport-specific sessions and build up week by week.
• Return to practice first, competition later, watching how the tendon responds the next day.

Pain monitoring — how much pain is OK?

Some pain during tendon rehab is allowed — and even expected. The usual rules:

• Rate pain from 0–10 (0 = none, 10 = worst imaginable).
• Pain up to about 3–5/10 during exercise is acceptable — you can keep going.
• Above 5/10: reduce the weight, cut sets, or drop back a stage.
• Two safety checks:
  • Pain should settle back to baseline within 24 hours (or by the next morning).
  • Pain should not be trending upward week to week; morning stiffness should gradually shorten.
• Use the same “pain test” every morning — for example a single-leg heel raise or a single hop — and note the score. That gives you an objective trend.
• More pain the next day, or a rising trend over several days, means yesterday’s dose was too much. Scale back.

A sample program — Achilles tendinopathy

Below is a common framework for midportion Achilles tendinopathy. Timeframes are rough guides only — progress by symptoms and strength, and expect full recovery to take 3–6 months or more. Be patient.

Demo video: eccentric heel-drop exercises for Achilles tendinopathy and when to use them — Treat My Achilles channel (demonstrated by physiotherapists).

• One caution: if your pain sits right where the tendon attaches to the heel bone (insertional Achilles tendinopathy), don’t lower your heel below floor level early on (no dropping off a step edge) — that compresses the sore spot. Also skip calf stretching for now and add a heel lift in your shoe: a randomised trial found this compression-reducing approach clearly outperformed full-range heel drops.

Common mistakes

• Resting completely and waiting it out — the tendon gets weaker, and pain returns as soon as you do.
• Stretching aggressively into pain — for compression-type problems like insertional Achilles tendinopathy, hard stretching squeezes the painful area and makes things worse.
• Progressing by the calendar — “it’s been 6 weeks so I should be jumping now” is wrong. Progress by strength and symptoms.
• Relying on passive treatments alone — massage, ice, and electrical stimulation may feel nice, but without loading there is no lasting change.
• Ramping straight back to full volume once pain fades — pain disappears before tendon capacity returns; going too hard too soon is the classic relapse story.
• Training only the sore spot — the whole chain (calf, hips, trunk) needs strengthening.

When to seek medical care — red flags

See a doctor promptly — don’t keep self-rehabbing — if you notice:

• A sudden pop or snap during activity followed by immediate weakness (possible tendon rupture).
• Being unable to bear weight or to rise onto your toes at all.
• Marked swelling, redness, or warmth, or a fever (infection must be ruled out).
• Pain at rest that keeps worsening at night, unrelated to activity.
• No progress at all after 2–3 months of a properly done loading program.

Frequently asked questions

Q: Do I have to stop training completely?

• Usually no. Most people can adjust load rather than stop: cut the jumping and sprinting, keep whatever training stays within acceptable pain.
• Research shows that continuing sport under a pain-monitoring model works as well as resting from sport — especially relevant for in-season athletes.
• One caveat for competitive athletes: simply adding strength work on top of an already high training load has not been shown to help. The training load itself has to come down.

Q: Is it safe to exercise with pain?

• Pain up to 3–5/10 that settles within 24 hours is acceptable and does not mean you are damaging the tendon.
• What matters is the trend: pain climbing week after week is the warning sign.

Q: Why not just get an injection?

• Steroid injections do relieve pain in the short term (roughly 4–8 weeks), but used on their own the medium- and long-term results are worse — and repeated injections can weaken the tissue. In tennis elbow, one-year outcomes after injection were worse than physiotherapy and worse than doing nothing.
• There is an important recent exception: in a randomised trial in Achilles tendinopathy, an ultrasound-guided steroid injection combined with exercise therapy and strict activity restriction (no running or jumping for three months) beat placebo at 1–6 months, and the benefit held at 1–2 years.
• The difference was genuinely unloading the tendon alongside the injection, not injecting and carrying on as before. So injections are an add-on: useful to get you through a phase too painful to train, but never a substitute for loading exercise.

Q: How long until I’m better?

• Standard exercise programs run 12 weeks, and most people improve noticeably within that window, with gains holding at one year. Getting all the way back to full sport commonly takes 3–6 months or more; long-standing cases can take up to a year.
• Recovery is not a straight line — small setbacks are normal. Judge yourself by the overall trend.
• One common source of confusion: tendon thickening and increased blood flow on ultrasound can persist after the pain has settled. That does not mean you haven’t healed — pain and function are what count, not the picture.

Q: Are eccentric exercises better than other exercises?

• Not necessarily. Eccentrics (like Alfredson heel drops) have the longest track record, but heavy slow resistance works just as well — and many people find it more comfortable and easier to stick with.
• Pick the version you can do consistently. Consistency beats exercise style.