Running is not a two-legged sport. You are never on both feet at once, so every stride is a controlled landing on one leg, absorbed and returned, 160 to 180 times a minute. A marathon is somewhere near 40,000 of those landings, each loading the foot, shin, knee and hip at around two and a half to three times your body weight, and each asking the pelvis and trunk to hold position while the other leg swings through underneath you.
That is the demand. Most of what gets sold to runners as “core work” never engages with it.
Why does my hip drop when I get tired?
The moment worth understanding is midstance — the instant your weight is fully over one leg. The supporting hip has to resist the opposite side of the pelvis dropping away, and it has to do it in the frontal plane, sideways, which is not the direction your running training loads you in.
When that control fades, the pelvis tilts. Bramah and colleagues measured this across runners with four common injuries — iliotibial band syndrome, patellofemoral pain, medial tibial stress syndrome and Achilles tendinopathy — and found injured runners shared a pattern: more contralateral pelvic drop and more forward trunk lean at midstance. Pelvic drop was the single strongest variable separating the injured group from the healthy one, with each additional degree associated with substantially higher odds of being in the injured group.
Read that carefully, because it is an association in a cross-sectional study, not a cause. The broader picture is more cautious still: Ceyssens and colleagues reviewed the biomechanical risk factors for running injury and found the evidence limited and often conflicting across studies. We do not get to say that a dropping hip caused your shin splints. What we can say is that it is a movement fault worth being able to control, and that it is specific enough to be assessed rather than assumed.
Does trunk work actually do anything for my running?
The honest answer depends on what you are asking it to do.
For injury, the strongest evidence is not about Pilates — it is about strength training generally. Lauersen and colleagues pooled randomised controlled trials covering more than 26,000 participants and found strength training reduced overuse injuries by roughly half, while stretching showed no comparable effect. That is a large, consistent finding.
For performance, Blagrove and colleagues reviewed the effect of strength training on distance runners and found improvements in running economy and time-trial performance, with no change in maximal oxygen uptake or body composition. In other words it makes you cheaper to run at a given pace, rather than raising your ceiling.
Both of those are about strength training. Pilates is not strength training, and it would be dishonest to borrow their results.
What does the evidence say about Pilates specifically?
Thinner than anyone selling it would like.
The most useful single trial is Finatto and colleagues, who randomised 32 recreational runners to twelve weeks of mat Pilates twice a week alongside their running, or to running alone. The Pilates group improved their 5 km time from about 25.7 to 23.2 minutes and reduced the metabolic cost of running at 12 km/h, with lower electrical activity in the postural muscles at submaximal pace — which is a plausible mechanism rather than a lucky result.
It is also one trial, with 28 runners in the final analysis, all of them men. That is not a basis for promising you anything. It is a reason to think the mechanism is worth pursuing in a properly individualised programme, and to keep measuring whether it is working for you specifically.
So: no claim here that Pilates prevents injury, corrects an imbalance, or makes you faster. The mechanism is coherent and the early evidence is encouraging. That is the accurate version.
Where it fits — and where it does not
Pilates does not replace your mileage, your strength work, your coach or your physiotherapist. If you are injured, the physio leads and I work around them. If you are training for a time, your running programme is the training and this is one supporting session inside it.
What it can do that running cannot is load single-leg control and trunk endurance deliberately, at an intensity you choose rather than one your race dictates.
How I would actually programme it
The same way I programme anything. I assess your body and how it moves first — what your hip does under load, what your trunk does when it is tired, what your old injuries left behind. Then I compare that against what running specifically demands of you, which is not the same list as what triathlon or powerlifting demands. From there we build the programme, load it progressively, and reassess.
Your race calendar shapes all of it. Base phase is where unfamiliar loading belongs. The weeks before a goal race are not the time to introduce something your legs have to learn.
Exercise choice follows the objective, not a list. If your pelvis drops at midstance, we work in single-leg standing positions, because that is where that control lives — not in a supine exercise that never asks your hip to hold your body weight. If your trunk gives out in the last hour, we train it for time under load rather than for how it feels in the moment. If your thoracic spine will not rotate, we address that before asking your lower back to make up the difference.
The first step
An initial consultation is an assessment, not a class. I look at how you move, we talk about your training and your calendar, and you leave knowing what I think is worth working on and why. If the answer is that your time is better spent on your strength programme, I will tell you that.