What a treadmill gait analysis can see in ten minutes, what it cannot, and how the runs already on your watch fill the gap.
The short answer
An in-store gait analysis films you jogging on a treadmill, usually for a few minutes, and turns that clip into a shoe suggestion. Format and depth vary a lot between shops. Run-It is a data-led alternative to in-store gait analysis: it reads the Garmin and Stryd runs you have already recorded, across your real paces, routes, and accumulated fatigue, and returns a road-shoe shortlist.
Try the shortlist on before you buy and you have both halves of the decision covered. What Run-It brings is the sample. Across 157 runners analysed by Run-It, the median history behind a recommendation is 35 processed runs and 318 km, spread over 108 days of training, against one session in a shop.
What an in-store gait analysis actually measures
The appointment is usually short. You jog on a treadmill in neutral shoes or socks while a fitter films your feet from behind. Some shops give you longer, ask more about your training, or let you run outside; others work through it in a few minutes. The clip gets slowed down, someone reads the angle of your ankle as it lands, and you leave in a category: neutral, overpronator, or supinator. That category then drives the shoe wall.
What the treadmill clip can show
It is a real measurement and it earns its place. A fitter can spot obvious asymmetry, an arch that collapses under load, or a stride that visibly settles when you switch pairs. They can put you in three shoes back to back and watch what changes. No watch gives you that, and no dataset gives you a second opinion in the moment.
Where the sample runs out
A few minutes on a belt is a small slice of a training week. You are indoors, at a speed someone else chose, on fresh legs, in a shop, being watched. Treadmill and overground running are not biomechanically identical across every measure,[1] and none of your hills, your Sunday long run, or your tired final kilometres are in the sample.
The category at the end carries less weight than most runners assume, and the research pulls in both directions. Trials that assigned shoes by foot type did not produce the injury reductions the model predicted,[2][3][4] pronation has not been established as an injury risk factor in novice runners,[5] and a Cochrane review rated the evidence for shoe features preventing running injuries as uncertain.[7]
Pointing the other way: a blinded randomised trial of 372 recreational runners found lower overall injury risk in the group given motion-control shoes, and the effect was largest in the pronated-foot subgroup (hazard ratio 0.34, 95% CI 0.13–0.84).[6] Foot posture may well matter for some runners. What the evidence does not support is treating a category assigned in one short session as a settled answer. We went through this research in detail in can gait analysis help me choose running shoes.
What Run-It measures instead
Run-It starts from runs you have already done. Connect Garmin or Stryd, or upload an original FIT file with running dynamics, and it reads the movement signals recorded in each activity: cadence, ground contact time, vertical oscillation, stride length, and pace.
A recovery run, a Tuesday tempo, and the last five kilometres of a Sunday long run ask different things of your legs and your shoes. Ground contact time lengthens. Cadence drifts down. Vertical movement changes. Run-It reads those signals in their pace and fatigue context rather than flattening them into one number.
One run is weak evidence. Repeated runs in the same pace zone are the pattern worth trusting, and only a training history is long enough to show one.
Sizing rides along with the movement signals. Run-It builds personalised size guidance from reviewed official brand charts, anchored on the sizes and fit ratings you record for pairs you already own, and uses your width feedback to filter and rank the shortlist. A brand that runs half a size small stops being a surprise.
What that looks like in our own data
Across 157 runners analysed by Run-It, the median training history behind a shoe recommendation is 35 processed runs, 318 km, and 108 days. The bottom quartile still arrives with 18 runs and 128 km. The top quartile brings 68 runs and 603 km.
For shoe choice the spread matters more than the total. Among runners with at least three recorded runs, the gap between their slowest and fastest run is 2.3 min/km at the median, and 3.7 min/km at the 75th percentile. 82% (129 of 157) have runs across all four types Run-It classifies: daily, tempo, race, and long run. A treadmill sample sits at one speed.
First-party aggregate data, Run-It, September 2026. "Processed" means a run that cleared Run-It's analysis pipeline. Figures are medians across the 157 runners with at least one processed Garmin or Stryd run; the pace-spread figure covers the 154 with three or more. About nine in ten runners who sync a source reach a usable run (157 of 175).
Run-It vs in-store gait analysis, side by side
The two methods answer different questions. Here is where each one is actually strong.
| Question | Run-It | In-store gait analysis |
|---|---|---|
| What it observes | Cadence, ground contact time, vertical oscillation, stride length, and pace, read from the compatible runs you have synced or uploaded. | Foot and ankle motion on video, usually filmed from behind while you jog. |
| Where you run | Your own routes, outdoors, in the shoes you actually train in. | A treadmill in the shop, in neutral shoes or socks. |
| Sample length | The compatible runs you have synced or uploaded, growing as you keep training. Median across our own users: 35 runs, 318 km, 108 days. | One appointment. Length and depth vary between shops. |
| Pace range | Easy, tempo, long-run, and race paces as you run them week to week. Median spread between a runner’s slowest and fastest run: 2.3 min/km. | The speeds that fit inside the appointment. |
| Fatigue | Early and later run segments, where the recording supports the comparison. | Fresh legs, at the start of the session. |
| Typical output | A road-shoe shortlist for daily, tempo, and race use, with Loading Pattern Index context. | A movement category and a few models to try on. |
| Shoe choice | 200+ road-shoe models to compare for daily, tempo, and race use, rather than only the pairs a local shop has in stock. | The models the shop has available in your size, with the benefit of trying those pairs on. |
| Shoe price | Checks the lowest listed price found among supported online retailers. | The shop's own price and any in-store offer. |
| Analysis price | Free. | Usually free with a shoe purchase at a specialty retailer. |
| Time and access | A few minutes to begin with compatible data, online whenever you need it. | A visit during opening hours; appointment and travel time vary. |
| Fit, width, and length | Personalised size guidance from reviewed official brand charts, anchored on the size and fit feedback you give for pairs you already own. Models that do not match your width are filtered out of the shortlist. | Measured and tried on in person, with the shoe on your foot. |
| What it needs | Garmin or Stryd runs with running dynamics. | A trip to the shop, and whatever time the appointment allows. |
We built Loading Pattern Index for this
Reading those signals across a batch of runs is only useful if it resolves into a decision. Loading Pattern Index (LPI) is Run-It's estimate of your loading pattern, shown on a 0–100 scale and always read together with pace. It brings the available Garmin or Stryd signals into one picture of how you load a shoe while running.
Run-It weighs that loading context against shoe properties: midsole firmness, the job the shoe is built for, and what is already in your rotation. That is the practical link between how you run and the pairs you are considering for daily training, tempo work, or racing.
For direct comparisons, Run-It looks for steady segments at comparable efforts, then uses early and later segments to show how your pattern shifts with fatigue. LPI keeps pace attached to the number, so a single figure never travels alone and the context behind it stays visible. Read how LPI works and how Run-It uses it for shoe matching.
What the fitting session adds
Three things worth getting from an appointment once you have a shortlist.
Fit
Run-It narrows length and width from your size history before you go. The shop confirms volume and how the upper holds your midfoot, with the shoe on your foot.
First impression
Some shoes are wrong in the first hundred metres. Putting them on settles that in a way no spec sheet can.
What is actually in stock
A fitter knows what exists in your size today and can put two pairs side by side while you decide.
A shop with a fitter who watches you run, asks real questions about your training, and lets you jog outside in the pair is worth the appointment. Walk in with a Run-It shortlist and it gets shorter and sharper: you are checking three pairs for fit rather than starting from an open question.
Choose shoes for the running you do
A daily trainer has a different job from a tempo shoe, and both have a different job from a race shoe. Run-It organises recommendations around those uses so the output maps onto a rotation rather than a single "best" pair.
Run-It turns your running data into a road-shoe shortlist for your training.
For pairs already in your rotation, the comparison gets sharper: repeated runs at similar paces on similar routes, one shoe against another. See how to compare your running shoes with Garmin and Stryd data.
How do I choose running shoes if the shop analysis did not help?
Write down what is still unresolved: the physical fit, a question about your movement, or which shoe to buy for your training. That tells you what kind of help to seek next.
Check the fit
If a pair squeezes your toes or slips at the heel, compare sizes and shapes. A fitter can help you try alternatives. Running metrics cannot tell you whether an upper pinches your foot.
Understand your movement
If you want someone to observe how you run, ask what a running or video assessment includes and who interprets it. Questions about pain belong with a qualified clinician; a shoe shortlist does not diagnose its cause.
Narrow the shoe choice
If you want road shoes for your usual training, Run-It uses compatible run recordings to recommend daily, tempo, and race options. Try the shortlisted pairs for fit and comfort.
For example, a runner replacing a daily trainer may already be happy with its fit but want a pair that suits longer outings. Run-It brings their available pace and fatigue context into the shortlist. The runner can then compare how the candidates feel on foot.
You can also choose shoes without recorded running dynamics. Start with your most frequent run and a comfortable fit, using our guide to which running shoes to buy. Add data-based comparisons when you have compatible recordings: Garmin and Stryd today, with Strava support on the way.
Use both, in this order
Treating this as a choice between two methods is the wrong frame. They answer different questions, so run them in sequence.
- Start with your data. Narrow a long list of plausible models down to a handful, using running you have already done rather than a session you are about to do.
- Take the shortlist to a shop. Check length and width, try each pair, jog in them. This is where the fitting session earns its place.
- Keep the data running afterwards. Compare repeated runs in the new pair against your old one at similar paces. Neither a store visit nor a first impression can tell you how a shoe behaves at kilometre 28.
Start with a run you already have
Run-It is a separate service from Garmin Connect. Open Run-It to connect Garmin or use a supported recording. The compatibility and upload FAQ explains the data requirements.
- Use Run-It with a supported Garmin or Stryd run. For manual uploads, use the original FIT file with running dynamics.
- Explore your running form and LPI, then read the shortlist for daily training, tempo sessions, or racing.
- Try your shortlisted pairs for fit and comfort, then follow how they work across your training.
Common questions
What is an in-store gait analysis?
An in-store gait analysis is a short treadmill assessment at a running shop. You jog while a fitter films your feet from behind, then reviews the slowed-down clip and suggests shoes, usually after placing you in a category such as neutral, overpronator, or supinator. Format and depth vary between shops.
Is Run-It a good alternative to an in-store gait analysis?
Run-It is a data-led alternative for the shoe-selection part. It reads the Garmin and Stryd runs you have already synced or uploaded, across your real paces, routes, and accumulated fatigue, and returns a road-shoe shortlist. Run-It also carries your size and width history into the shortlist, so models that have not fitted you before drop out. Trying the pairs on confirms it.
Is an in-store gait analysis worth it?
It is worth it for fit. A fitter measures length, width, and volume, and lets you compare pairs back to back in person. The shoe category that often comes out of the appointment rests on mixed evidence, so treat it as one input rather than a settled answer.
Can I choose shoes without Garmin or Stryd data?
Yes. Start with a shoe for your most frequent run, then check physical fit and comfort within your budget. Our guide to which running shoes to buy covers that path in full. Run-It needs compatible recordings for its data-based recommendations, and Strava support is on the way.
Is Run-It better than an in-store gait analysis?
The two answer different questions, and Run-It's advantage is sample size. A shop visit observes one session on fresh legs indoors. Across 157 runners analysed by Run-It, the median history behind a recommendation is 35 processed runs and 318 km over 108 days, including how movement changes as you tire.
How can I get running shoe recommendations from my Garmin data?
Connect Garmin or upload an original FIT file with running dynamics. Run-It reads cadence, ground contact time, vertical oscillation, stride length, and pace from compatible runs, then uses that context and Loading Pattern Index to build a shortlist for daily training, tempo sessions, and race day.
How does Loading Pattern Index help choose running shoes?
Loading Pattern Index (LPI) is Run-It's estimate of your loading pattern, shown on a 0–100 scale and read together with pace. Run-It considers it alongside shoe properties such as midsole firmness, run purpose, and your shoe history to inform the recommendation.
Why does running form across different paces matter for shoe choice?
Your easy runs, tempo sessions, and long runs can show different movement patterns, and those patterns shift as you tire. A treadmill sample on fresh legs cannot include the routes, efforts, and accumulated fatigue recorded across a training block.
Sources
- Van Hooren et al., Sports Medicine, 2020
- Richards, Magin, and Callister, British Journal of Sports Medicine, 2009
- Knapik et al., Journal of Strength and Conditioning Research, 2009
- Knapik et al., American Journal of Sports Medicine, 2010
- Nielsen et al., British Journal of Sports Medicine, 2014
- Malisoux et al., British Journal of Sports Medicine, 2016
- Relph et al., Cochrane Database of Systematic Reviews, 2022
