In Case 001, Sole Trace opens the file on one of running’s most common repeat offenders: Achilles “tendonitis.” Spoiler — it’s rarely a simple inflammation story. More often it’s tendinopathy: a tendon that’s been quietly falling behind the demands you’re placing on it… until it starts leaving clues. This episode investigates the main suspects, uncovers the motive (capacity vs demand), and outlines the evidence-led route back: smart load management, progressive calf strengthening, rebuilding the tendon’s spring, and judging progress by the 24-hour response — not vibes.

In this episode

• Why “tendonitis” is often the wrong label (and why it changes your approach)
• The difference between mid-portion vs insertional Achilles pain
• The classic Achilles clue: it may warm up during a run, then bite later (especially next morning)
• The key rule: judge the tendon by how it behaves 24 hours later
• Rehab principles: right dose, right timing, right progression
• When Achilles pain isn’t a normal case and needs urgent assessment

Main suspects (and their fingerprints)

• The Sudden Spike: mileage, intensity, frequency, or a new block too quickly
• The Hill Job: climbing demand added before the tendon had capacity
• The Shoe Switch: change in drop/stiffness + training load = double hit
• The Strength Paradox: “finally doing gym” but stacking calf load/plyos too soon
• The Compression Trap: aggressive heel-drop stretching, especially if pain is insertional (right on the heel)

The motive

Simple: mismatch. Training demand outpaced tendon capacity — repeatedly.

How Sole Trace cracked the case

• Followed the timeline (what changed + when symptoms started)
• Identified the location (mid-portion 2–6 cm above heel vs insertion on the heel bone)
• Tested real capacity, not best-day effort
• Trusted the tendon’s confession: next-morning stiffness and delayed symptoms

Evidence-led path back (high level)

• Control the chaos: reduce big aggravators (hard hills, sprints, bounding, sudden volume jumps; avoid deep dorsiflexion compression if insertional)
• Reload with intent: tolerable loading early on (often isometrics), then progress into heavy, slow calf strength (straight-knee + bent-knee)
• Rebuild the spring: add energy-storage work (hops/stiffness drills → progress)
• Return to running as a dose: structured exposures + progression judged by the 24-hour response

Practical takeaways

• If it feels “OK” while running but is worse next morning, the dose was too much.
• Rest alone often pauses the story — it doesn’t rebuild capacity.
• Location matters: insertional cases often hate aggressive stretching off a step.
• Goal isn’t “back to normal.” It’s back to better — with more capacity than your training demands.

Disclaimer

Educational content only; not a substitute for personalised medical advice, diagnosis, or treatment.