Also called: Torn Achilles rehab; ruptured Achilles; calf strength after an Achilles repair or boot
Exercise is the main treatment
Strength
Stretch
Massage
After the tendon tears and the boot comes off, the calf has been switched off for weeks and the healed tendon is usually longer than it was. That combination costs push-off power - and heel-rise height and endurance stay down for years unless the calf is rebuilt deliberately.
How common: About 31 per 100,000 people a year, rising steadily, most of them active adults in their late 30s to 40s; calf strength on the injured side is still down at one year in most people, whether operated on or not
What it is
An Achilles rupture is a sudden complete tear, usually during a push-off, often described as being kicked in the back of the leg. Whether treated surgically or in a boot, the tendon heals - but it commonly heals a few millimetres longer than it was.
That elongation is the crux. A longer tendon means the calf muscle sits at a shorter length and cannot generate the same force at the same joint angle. Combined with weeks of the calf being immobilised, it produces a deficit in heel-rise height and endurance that persists for years in people who do not train it back - and which most people are never told to look for.
What it feels like
- Unable to rise fully onto the toes on that leg, or unable to repeat it many times
- A visibly smaller calf on the injured side, sometimes years later
- Reduced push-off, so walking, running and stairs feel different
- Fatigue in the calf far sooner than on the other side
- Confidence lower on that leg, particularly for jumping or fast changes of direction
What causes it
Most people have more than one of these at once, and they feed each other. Read the
list looking for the two or three that sound like your week rather than for the one
true answer — the ones that describe you are the ones worth acting on.
- Tendon elongation during healing
- The healed tendon is commonly longer than the original. A longer tendon changes the calf's working length and directly reduces the force it can produce at push-off - and it is not reversible by training.
- Weeks of immobilisation
- The calf is switched off in a boot or cast for six to eight weeks. Muscle loss over that period is substantial and it does not return without deliberate progressive loading.
- Rehabilitation that stops too early
- Most protocols get people walking and back to daily life and stop there. Heel-rise endurance and single-leg power take a year or more of continued work, and almost nobody is told that.
- Loading that never gets heavy enough
- Restoring calf function requires genuinely heavy work - full-range single-leg heel raises with added load. Band work and double-leg raises do not reach the threshold.
- Loss of the soleus specifically
- The deep calf muscle is the main contributor to push-off endurance and is trained with the knee bent, which most programmes never include.
- The other side compensating
- The uninjured leg quietly takes over, which masks the deficit in daily activities and allows it to persist unnoticed for years.
- Fear of re-rupture
- Understandable and it limits loading at exactly the point loading is needed. Re-rupture rates are low after the early healing phase, and under-loading has its own cost.
- Age and tendon quality
- Ruptures typically happen in people between thirty and fifty with tendons that were already degenerating. That underlying tendon quality affects the recovery too.
Who tends to get it
- Anyone who has ruptured an Achilles tendon, whether treated surgically or not
- People whose rehabilitation stopped once walking was comfortable
- Anyone who never progressed to heavy single-leg calf work
- People returning to sport, in whom the deficit shows up most
- Anyone who has been in a boot for a prolonged period
What makes it worse, and what settles it
Makes it worse
- Stopping rehabilitation when walking feels normal
- Double-leg calf raises only, which the good leg dominates
- Never training the soleus with a bent knee
- Returning to jumping or sprinting before single-leg heel-rise endurance matches the other side
- Avoiding loading out of fear long after the healing phase
Settles it
- Progressive heavy single-leg calf raises through full range, continued for a year or more
- Bent-knee calf work to target the soleus specifically
- Measuring heel-rise height and repetitions on both sides, so the deficit is visible rather than assumed gone
- Gradual reintroduction of hopping and jumping once endurance is restored
- Massage and range work on a calf that has been immobilised and is stiff
What actually helps
The short version: The tendon tore under a sudden push-off, then spent weeks in a boot with the calf switched off. The healed tendon is often longer than it was, which means the calf cannot generate the same push-off, and the heel-rise height and endurance stay down for years unless the calf is rebuilt with heavy, patient loading
Strength work: Legs: Calves: Gastrocnemius - two-leg heel raises, then one-leg, then with weight, over months; Legs: Calves: Soleus - seated and bent-knee raises; Legs: Calves: Tibialis Posterior; Feet, Toes, Ankles: Intrinsic Foot Muscles; Legs: Hamstrings; Glutes: Max; Walking out of the boot as the protocol allows
Stretching: Legs: Calves and Legs: Calves: Achilles Tendon only AFTER the surgeon or physiotherapist clears stretching, usually past 12 weeks - stretching a healing Achilles early lengthens it permanently and weakens the push-off; Feet, Toes, Ankles; Legs: Hamstrings
Massage: Legs: Calves; Scars & Adhesions around a repair scar once healed; Legs: Hamstrings; Massage Stick on the calf, never on the tendon in the first months
Also worth doing: Heel lifts in both shoes early on, reduced gradually; follow the protocol's weight-bearing stages exactly; expect nine to twelve months before running feels normal and keep the heel raises going for a year; count single-leg heel raises each month and compare sides
What the evidence says: Long-term studies find heel-rise height, repetitions and work still reduced on the injured side one year after surgery and deficits persisting up to ten years, in operated and non-operated patients alike. Early progressive strength loading within the protocol improves function; early stretching into dorsiflexion is what elongates the tendon and is now avoided in modern protocols.
The names above are the Targets qFIT tracks —
the Muscle Guide explains what each one does, and
Quick Add switches on the Exercises you
already have.
The qFIT routine for this
Ready-made routineAchilles Tendinopathy PT (mid-portion, insertional & retrocalcaneal)
qFIT already has this one built. It runs massage first, then stretching, then
strength — the order that works on a body that is already sore — and every
activity in it carries the reason it is there.
The button below opens your Checklist with this routine already selected, so instead
of your whole list you land on just its Categories, Targets
and Exercises, each with its checkbox, ready to tick as you work through
them.
Have more than one problem? Tick yours under My Problems on
My Profile and your Checklist's Routine list gains
Recommended for my problems — every routine for the problems you picked, merged
into one. Your picks stay private; that filter is the only thing they feed.
Get it checked if…
A sudden pop or new weakness in the healing tendon - re-rupture, urgent; calf pain with swelling or breathlessness - clot, urgent; wound redness or discharge after surgery
And whatever the body part: chest pain or unusual breathlessness on
exertion; a fever alongside the pain; unexplained weight loss; pain that is constant and
unrelated to how you move; new numbness, weakness or loss of bladder or bowel control; or
one calf that is swollen, warm and painful. Any of those, stop and get assessed.
How it usually goes
Walking recovers in months and calf function takes a year or more - and in many people it never fully returns, because the training stops long before the deficit does. Measured heel-rise height and repetition deficits are commonly still present at one and two years in people who did standard rehabilitation. The good news is that the deficit responds to heavy loading whenever it is started, including years later, so it is worth addressing even long after the event.
Prevalence basis: Achilles tendon rupture epidemiology and long-term function studies (Sports Medicine 2026 systematic review; gait analysis cohorts)
Others the same routine covers
These share the Achilles Tendinopathy PT (mid-portion, insertional & retrocalcaneal) routine, so the work is the same. If one of them also
sounds like you, that is a reason to expect more from it, not less.
This is general information, not a diagnosis, and it cannot examine you.
If it matches you, use it to ask better questions of a clinician rather than to replace one.