How to Fix Achilles Tendinopathy: The Honest Guide

You get out of bed and the first few steps feel like your heel is set in concrete. It loosens up once you get moving, so you tell yourself it's fine. Then you run, or push off hard, and there's that sharp, specific ache at the back of your ankle reminding you it's very much not fine.

You've probably already tried the obvious stuff. Rest. Stretching the calf. New shoes. Maybe it settled for a bit, then came straight back the moment you loaded it again.

Achilles tendinopathy is one of the most common, most frustrating, and most mismanaged lower-limb problems in active adults. The good news is it responds genuinely well to the right approach. The bad news is the right approach is slower and more boring than the internet wants it to be. Let's go through it properly.

First, Let's Kill Some Bad Advice

Before we build the right plan, we need to clear the field of the stuff that keeps people stuck.

"It's inflamed, so rest it." The old name was Achilles tendinitis, the "itis" implying inflammation. That name has been retired for a reason. This isn't primarily an inflammatory condition. It's a tendon that's become irritated, structurally stressed, and less tolerant of load than the demands you're placing on it. It's a capacity problem. And you don't fix a capacity problem by resting, because rest lowers capacity further. You feel better while you're doing nothing, then flare the moment you return, because nothing actually changed. (Sound familiar? It's the same trap we describe in Why Your Back Pain Keeps Returning.)

"Stretch your calf more." Stretching can feel good and give short-term relief, but it doesn't build the tolerance the tendon actually needs. And in one specific type of Achilles problem, stretching can actively make things worse, more on that shortly.

"Just push through it." The opposite error. Ignoring a tendon that's telling you it's overloaded, and hammering it anyway, is how a manageable problem becomes a chronic one. The answer isn't rest or "push through." It's load it properly, which is a specific, graded thing.

The One Distinction That Changes Everything: Where Does It Hurt?

Here's the single most useful thing in this entire article, and it's the thing most generic advice completely skips.

There are two main types of Achilles tendinopathy, and they need to be handled differently. Getting them mixed up is one of the most common reasons a sensible-looking rehab plan stalls or flares.

Midportion Achilles tendinopathy. Pain sits in the meaty part of the tendon, roughly 2 to 6 cm above where it attaches to your heel bone. This is the more common one and the one with the most research behind it.

Insertional Achilles tendinopathy. Pain sits lower, right where the tendon anchors into the heel bone. This one is grumpier, often more stubborn, and, crucially, it doesn't like being compressed.

Why does this matter so much? Because the classic Achilles exercise everyone gets handed, deep heel drops hanging off the edge of a step, takes the tendon into deep dorsiflexion (toes up, heel down). For a midportion tendon, that's often fine. For an insertional tendon, that deep position compresses the tendon against the heel bone and can wind it right up. Same with aggressive calf stretching.

So if you've been diligently doing deep heel drops off a step and your low, at-the-heel Achilles pain keeps getting worse, you may not be failing rehab. You may be doing the wrong version of it for your specific problem. Working out which type you've got is one of the first things a proper assessment is for.

What Actually Fixes It: Progressive Loading

The unglamorous core of Achilles rehab is progressively loading the calf and tendon until its capacity comfortably exceeds the demands of your life and sport. That's the whole game. Everything else is a detail.

Two loading approaches dominate the research, and the reassuring news is they work about equally well.

Eccentric heel drops (the Alfredson protocol). The old-school standard. High-volume heel drops, emphasising the lowering phase. Decades of evidence support it for midportion tendinopathy.

Heavy Slow Resistance (HSR). Weighted calf raises done slowly through both the lifting and lowering phases, roughly three seconds up and three seconds down. A head-to-head randomised trial found HSR produced results just as good and lasting as eccentric training for midportion Achilles tendinopathy, with people tending to find it more satisfying and easier to stick to because it's a lower time commitment.

The key principles that make either one actually work:

Load heavy enough to matter. This is where most home attempts fail. Bodyweight calf raises alone usually aren't enough to drive real tendon adaptation. Tendons remodel in response to meaningful strain, which means the load has to be genuinely challenging and progressed over time. Light, easy reps you can do half-asleep won't shift capacity. (See also: Why Your Physio Exercises Aren't Working.)

Move slowly. Slow, controlled contractions with time under tension do more for a tendon than fast, bouncy reps. Roughly six seconds per rep is a common target.

Respect the type. Midportion tendons generally tolerate loading through a fuller range, including that deep heel-drop position. Insertional tendons need you to start in a shortened-to-neutral range and avoid deep dorsiflexion early, then gradually reintroduce more range as tolerance builds. This one distinction prevents a huge amount of unnecessary flare-up.

Some discomfort during loading is acceptable. This scares people, so let's be clear. With tendon rehab, a mild-to-moderate ache during and shortly after loading, in the range of a 3 or 4 out of 10 that settles within 24 hours, is generally fine and expected. It's not a signal to stop. Pain that spikes sharply, keeps climbing, or is markedly worse the next morning means the dose was too high and needs pulling back. Behaviour over 24 hours is the tell, not the presence of any sensation at all.

How the Journey Actually Progresses

Rehab isn't just "do calf raises forever." It moves through phases, and each one earns its way to the next.

Early phase: settle and start loading. The goal is to calm the most irritable symptoms while starting to load in a way the tendon can tolerate. This often means temporarily reducing the aggravating activity (cutting running volume, easing off hills and sprints) without stopping everything. Isometric holds, holding a calf raise position under load, can be useful here for some people to load the tendon and help manage pain while you build a base.

Middle phase: build real strength. This is where the heavy, slow loading does its work over weeks. Load progresses as capacity improves. This is the longest and least glamorous stretch, and it's the part that actually changes the tendon. The research protocols run around 12 weeks for a reason, and stubborn cases run longer.

Late phase: rebuild spring and speed. A tendon isn't just a strength structure, it's a spring. For runners and athletes, the final phase has to reintroduce the fast, elastic, energy-storing loads of running, hopping, and jumping. Strength without this step leaves you strong in the gym but not ready for sport. A powerful calf that's never been re-exposed to running load isn't a rehabbed Achilles yet.

Return to running and sport: earn it, don't guess it. Going back because it's "been a few weeks" or "feels okay walking around" is how people re-injure. Walking around pain-free is a low bar. The tendon needs to demonstrate it can handle graded running and impact load without flaring the next day. Feeling ready and being ready aren't the same thing, a theme that runs through everything we do (see Strong But Not Stable).

What About Shockwave, Injections, and the Rest?

You'll see plenty of add-ons marketed for Achilles pain: shockwave therapy, injections, orthoses, night splints, massage. Here's the honest positioning. The evidence for loading as the primary treatment is far stronger than the evidence for any of these as a standalone fix. Some adjuncts may have a supporting role in specific, stubborn cases that haven't responded to a genuine loading program, but they're the supporting cast, not the lead. If a treatment plan skips straight to the passive add-ons and never gets you loading properly, the main ingredient is missing. (We've made this same case about injections specifically in Should You Get a Cortisone Injection?)

One Important Safety Note

Most Achilles pain is a tendon load problem with a load solution. But a couple of things warrant prompt, proper assessment rather than self-managing. A sudden, sharp "someone kicked me in the back of the leg" sensation, often with a pop, followed by weakness pushing off or standing on your toes, can signal an Achilles rupture, and that needs urgent attention, not a loading program. Likewise, if pain is escalating despite sensible management, or the picture doesn't fit, it's worth getting looked at rather than guessing.

The Takeaway

Achilles tendinopathy feels stubborn because it's almost always managed backwards, with rest and stretching aimed at an inflammation that isn't really the problem. It's a capacity problem, and capacity is built by loading the tendon progressively, heavily, and slowly, over a timeline measured in months, not weeks.

The single biggest edge you can get is knowing which type you have, because the midportion and insertional versions want different things, and treating one like the other is why so many people spin their wheels.

Your Achilles isn't broken. It's underprepared for what you're asking it to do. And that's fixable, with the right plan and enough patience to see it through the boring middle.

If your Achilles has been grumbling for weeks or months and rest and stretching haven't shifted it, the first step is working out exactly what type you've got and what your tendon can currently handle. Book an assessment and let's build a plan around that, not guesswork.

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