Returning to Running After Achilles Tendinopathy

Returning to Running After Achilles Tendinopathy

Achilles tendinopathy (often called “Achilles tendinitis”) is one of the most common overuse problems in runners. It can show up as soreness, stiffness, or sharp pain along the tendon—either 2–6 cm above the heel or right where the tendon inserts on the heel. A common pattern is feeling “fine” once warmed up, only to flare later that day or the next morning.

On the bright side, most runners return successfully when rehab follows two main principles—progressive re-loading of the tendon and smart running load management.

Why it happens

Tendons in general respond well to load, but they don’t always love to tolerate sudden changes in load. The Achilles tendon is specifically designed to store and release energy like a spring every time you walk, run, or jump.

Achilles symptoms commonly begin when demand exceeds current capacity, such as:

• A rapid increase in weekly mileage
• Adding hills or speed work too quickly
• Returning to running after time off
• Changing shoes (especially big changes in heel drop) or terrain

Modern tendon research describes tendinopathy as a process that can shift along a “continuum,” where the tendon becomes more reactive/irritable when loads spike and can become more persistent if the mismatch continues. The clinical takeaway: rehab should match the tendon’s current irritability and gradually build capacity.

Rehab principle 1: progressive overload

The tendon doesn’t get “better” by doing nothing—it improves by receiving the right amount of loading, repeated consistently, with adequate recovery. Clinical guidelines emphasize that progressive tendon loading is the cornerstone of conservative management for Achilles tendinopathy.

Progressive overload means gradually increasing one variable at a time:

• Load (heavier resistance)
• Volume (more total reps/sets, or more running minutes)
• Speed (faster calf work as tolerance improves)
• Impact (walk → jog → run → hills → faster running)

A common mistake is trying to return to continuous running before the tendon has regained strength and “spring” capacity. A better plan rebuilds in phases: strength first, then energy storage (impact) later.

Pain during rehab: how much is “okay”?

A tendon-friendly return to running often involves some symptoms, especially early on. The goal isn’t “zero pain at all costs.” The goal is symptoms that stay within an acceptable range and do not worsen over time.

A widely used approach in Achilles rehab is the pain-monitoring model. In that research, pain during and after exercise was allowed up to 5/10 (0–10 scale), as long as it settled and did not progressively worsen.

For most recreational runners returning to impact, many PTs use a similar, or even more conservative clinic guideline that is easy to remember and apply:

• Keep pain under 5/10 during rehab exercise and during return-to-run sessions
• Symptoms should settle back toward baseline within 24 hours
• Next-morning pain/stiffness should be no worse than usual

If pain repeatedly exceeds that range, lingers into the next day, or trends worse week to week, the tendon is telling you the load jumped too fast—and the plan needs to step back and rebuild.

Building the base: strengthening before running volume

A successful return to running usually starts with restoring calf and tendon capacity. A PT will tailor this relative to your fitness level and how irritable the tendon is, but the general progression looks like this:

1. Tolerance-building strength

• Calf raises (big variety, often starting double-leg and progressing to single-leg)
• Gradually add external load (dumbbells, machine, backpack)
• Build both strength and endurance over time

2. Energy-storage preparation
   Once daily activities and strengthening are tolerated, rehab progresses toward faster and more elastic work (the kind your tendon needs for running):

• Quicker calf raises
• Controlled hopping/landing drills
• Then higher-demand plyometrics as tolerated

Return-to-sport frameworks for Achilles tendinopathy emphasize progressing from strength work to energy-storage loading and sport-specific demands in a staged way.

A practical return-to-running progression (walk–jog works best)

When symptoms are stable (not worsening week to week) and strengthening is tolerated, return to running should start with intervals, not continuous running. Intervals let you dose impact, monitor symptoms, and progress without guessing.

An example starting point (every other day at first):

• 1 minute easy jog / 2 minutes walk × 8 rounds (24 minutes total)

If pain stays under the guideline and the 24-hour response is acceptable, repeat that session 2–3 times before progressing.

Progression ideas (change only one variable at a time):

• 1:2 → 1:1 (same total time)
• 1:1 → 2:1
• 2:1 → 3:1
• Then gradually increase continuous easy running time

Early return-to-run rules that protect the tendon:

• Keep runs flat (avoid hills early)
• Keep pace easy (avoid speed work early)
• Avoid back-to-back run days at first (tendons often prefer more recovery between impact sessions)

This, of course, is a general example that can vary largely based on your previous fitness and strength levels before injury.

When to get help

If pain is persistent, keeps spiking after each attempt to run, or you’re unsure where to start, a PT evaluation can save weeks of trial and error. The right plan depends on irritability, strength deficits, running history, footwear/training changes, and the tendon’s 24-hour response.

A well-structured program doesn’t just “rest the pain away”—it rebuilds the tendon so running becomes reliable again.

Sources

• Murphy M, Travers M, Gibson W, et al. “Rate of Improvement and Prognosis for Achilles Tendinopathy: Systematic Review and Meta-analysis.” Journal of Orthopaedic & Sports Physical Therapy (JOSPT), 2018.
• Silbernagel KG, Crossley KM. “A Proposed Return-to-Sport Program for Patients With Midportion Achilles Tendinopathy: Rationale and Implementation.” Journal of Orthopaedic & Sports Physical Therapy (JOSPT), 2015.
• Cook JL, Purdam CR. “Is tendon pathology a continuum? A pathology model to explain the clinical presentation of load-induced tendinopathy.” British Journal of Sports Medicine (BJSM), 2009.