I’ve treated and lived with my own share of stubborn lower-leg niggles, so when I started researching ways to manage recurring Achilles tendinopathy I kept coming back to one practical, well-studied approach: a nightly calf eccentric protocol. Over the years I’ve adapted this into a progressive, realistic plan I use with myself and recommend to readers and clients. Below I share the how, the why, and the exact progression I use — with clear pain limits and recovery guidance so you can try it safely at home.

Why eccentric loading helps Achilles tendinopathy

Eccentric exercises are movements where the muscle lengthens under load — for the calf that’s the lowering phase of a heel drop. Research shows that controlled eccentric loading can improve tendon structure, reduce pain, and restore function in many people with mid-portion Achilles tendinopathy. The mechanism isn’t magic: the repeated, controlled strain encourages tendon remodeling and improves the capacity of the calf-Achilles unit to handle load.

Importantly, eccentric work is best delivered in a progressive, pain-informed way. Too aggressive and you can inflame the tendon; too timid and you won’t create the stimulus needed for adaptation.

Who this protocol is for (and who should get medical advice)

This nightly eccentric protocol is intended for people with chronic or recurring mid-portion Achilles tendinopathy — the classic “pain 2–6 cm above the heel bone,” typically aggravated by activity and relieved by rest. If you have a recent, sharp traumatic injury, a suspected rupture, active infection, severe swelling, or progressive neurological symptoms, seek medical assessment before trying an exercise protocol.

How I structure the nightly protocol

I recommend performing this routine in the evening because tendons tolerate eccentric loading better later in the day for many people, and making it part of a bedtime routine improves adherence. The core elements are:

  • Warm-up: 5 minutes of gentle ankle and calf movement (walking, ankle circles, calf mobilizations).
  • Main set: a progressive eccentric heel-drop routine, performed slowly and with eyes on pain limits.
  • Cool-down: light stretching and self-massage if comfortable.

    • Clear pain rules I use and recommend

    Managing pain is central. I use simple, practical pain limits that you can monitor:

  • Acceptable pain during exercise: up to 4–5/10 on a 0–10 scale (where 0 = no pain, 10 = worst imaginable). Mild to moderate soreness is often okay.
  • Post-exercise pain: should not increase beyond baseline within 24 hours. If pain spikes the next day, reduce load or skip a session.
  • Persistent pain increase: if pain is worse two days after exercise or functional tasks become harder, stop and seek a clinician’s advice.

    • Progressive nightly plan (8–12 week outline)

    I’ve created a simple progression table you can follow. Increase one variable at a time — reps, load (weight), or tempo — and only progress if pain rules are respected.

    Week Reps x Sets Load Tempo Notes
    1–2 3 sets of 10 Bodyweight 3s descent, 1s lift Two-legged to single-leg partial if needed
    3–4 3 sets of 12 Bodyweight → small backpack (1–3 kg) 4s descent, 1s lift Start single-leg when comfortable
    5–6 4 sets of 12–15 Increase load gradually (add 1–2 kg) 4–5s descent Prioritize quality over quantity
    7–8+ 4 sets of 15 Progress to heavier load as tolerated 3–4s descent, controlled Begin plyometric prep only if pain-free

    Notes on the table: the eccentric phase is the lowering from the high-heel (raised) position to the ground. The concentric (raising) phase can be assisted by the other leg or performed with a quicker push if using Alfredson-style protocol variations.

    How to perform the basic single-leg eccentric heel drop

    I prefer the classic standing heel-drop because it’s easy and effective. Here’s my step-by-step:

  • Stand on a step with the forefoot on the edge and the heel off the back. Use a railing for balance.
  • Rise up onto both toes (or use both legs to push up) so your weight is on the forefoot.
  • Shift weight onto the affected leg and slowly lower the heel down below the step over 3–5 seconds (eccentric phase).
  • Use the non-affected leg to return to the starting position (or both legs) — the focus is on the controlled lowering.
  • Repeat for the prescribed reps and sets. Stop if pain exceeds your agreed limit.

    • Modifications and variations

    Not everyone can perform a painful single-leg lowering at first. I often use these modifications:

  • Two-legged eccentric heel drops (less load, good starting point).
  • Partial range-of-motion heel drops, gradually increasing depth.
  • Seated calf eccentric with resistance band to introduce eccentric control without high load.
  • Slow tempo vs. faster — slower increases time-under-tension and is useful initially.

    • Recovery strategies I pair with the protocol

    Exercise is only part of the program. I recommend pairing eccentric work with:

  • Load management: reduce repeated high-load activities (running, hill training) while you progress through the program.
  • Footwear: use supportive shoes with moderate heel height for training; avoid floppy shoes that increase tendon strain. A supportive running shoe such as the Hoka Clifton or Brooks Ghost can reduce peak loading when returning to running, but comfort is king.
  • Soft tissue care: gentle calf foam rolling and cross-friction massage can reduce local tightness but avoid aggressive work directly on an inflamed tendon.
  • Sleep, nutrition and hydration: tendons remodel slowly — good protein intake and adequate sleep help recovery.

    • When to introduce higher-load or plyometric work

    Once you can do the prescribed eccentric sets with minimal pain and your functional tasks (walking, stairs, short jogs) are comfortable, introduce heavier, faster work cautiously. I recommend:

  • Two weeks of progressive heavy slow-loading (increasing load) while monitoring pain.
  • Then add low-level plyometrics (double-leg hops) before single-leg reactive work.
  • Return to running with a graded program: short easy runs, reduced volume, and avoiding hills or speed until symptoms are stable.

    • Red flags and when to see a clinician

    Stop and consult a clinician if you notice:

  • Sudden severe pain or an audible pop — possible rupture.
  • Rapidly increasing swelling or redness around the tendon.
  • Nerve symptoms (numbness, progressive weakness).
  • Pain that worsens despite following the protocol and load reduction for >2 weeks.

    • Practical tips that improved my adherence

    What helped me stick with an evening routine:

  • Pair the protocol with a consistent cue — brush teeth, shower, or a ten-minute reading habit.
  • Use a small backpack or kettlebell for load progression; a filled water bottle works too.
  • Keep a log of pain and reps — small wins keep you consistent.

    • If you want, I can create a printable 8-week tracker for this protocol or a version tailored to runners. On onepairoffeet.co.uk I’ve also shared videos demonstrating form and progressions — reach out if there’s a specific variation you’d like me to film.