Most people get their devices for walking, standing or running. Then the weather turns, training moves indoors, and a new question shows up: do these belong in a squat? A spin class? Forty minutes of treadmill intervals? The answer has less to do with the name of the exercise than with what the shoe underneath you is built to do.

What a device is actually doing under load

A custom orthotic changes where pressure sits across the sole of the foot and how fast the arch flattens through each step. During a run, that matters a great deal. The foot loads and unloads hundreds of times per kilometre, and small changes in timing add up over an hour.

Under a loaded barbell the situation is close to the opposite. You are on both feet, moving slowly, and what you want most is a base you can feel. So the device is not automatically right or wrong the moment you walk into a gym. It is a tool with a job. Where the job exists, wear it. Where it does not, you may be adding height and softness to a situation that wants neither.

Barbell work and flat shoes

Lifters tend to prefer a firm, flat, low shoe. It keeps the heel, ankle and knee stacked in a predictable line and sends clear information up from the floor. Dropping a posted device into that shoe raises the heel slightly, softens the contact, and can change how the knee tracks through a squat or a deadlift.

Plenty of people lift with theirs in and never think about it. Others find the bar path feels less settled. If you are in the second group and your feet are symptom free during lifting, leaving the devices out of your lifting shoes is a reasonable call. Put them back in for the warm up, the walk home and the rest of the day.

Two situations argue for keeping them in anyway. The first is pain that appears specifically during loaded standing. The second is a device built to offload one spot, a tender heel or a sore area under the ball of the foot. If that is the reason the orthotic exists, pulling it out for the heaviest part of the session removes the protection exactly when it is doing the most.

Treadmill, classes and court shoes

Indoor running is the easy case. A treadmill asks much the same thing of the foot as the sidewalk does, minus the camber and the ice, so a device you run in outdoors stays in. Studio classes built on jumping, lunging and lateral work usually sit on the same side of the line, since the forces are impact forces and the shoe is a cushioned trainer with room to spare.

Court shoes are where fit gets tight. Basketball and squash shoes are cut narrow through the heel, and the factory insole is often glued down along its edges. If you play most weeks and move between activities, how a prescription shifts from one sport to another is set out in our guide to sport specific orthotics for running, soccer and golf.

Volume is what usually goes wrong

When someone tells us their orthotics do not work at the gym, the prescription is rarely the problem. A device went into a shoe that was already full of foam.

• Take the shoe's own insole out before anything else. If it will not lift, the shoe is a poor host and a different pair is the fix.

• Redo the lacing after the swap. The device sits your foot closer to the upper, so yesterday's tension feels tighter across the instep today.

• Watch the toe box. Crowded or numb toes twenty minutes into a skipping set is a space problem, not something to train through.

• Check the age of the shoe. Gym shoes that have been through two winters of classes may be the variable you are blaming on the device.

Footwear does more of the work here than people expect, and the order you tackle things in matters. We went through that sequencing recently in orthotics versus supportive shoes.

Spin, rowing and anything that locks the foot down

Cycling and rowing shoes hold the foot in one position against a rigid plate. Vertical room is minimal, and the load sits on a small area for a long stretch. A full thickness walking device often will not physically fit, and forcing it in can create pressure where none existed before. Thinner, shorter builds are made for this. If a bike is a big part of your winter, say so at the assessment rather than after the devices are finished.

One pair or two

A single pair moved between shoes works for most people most weeks. The case for a second pair is usually practical rather than clinical: you train at six in the morning and would rather not swap devices in the dark, your training shoes and work shoes are shaped nothing alike, or one activity genuinely needs a different build. Coverage for a second pair varies by plan, so read the wording before counting on it. The claim mechanics are laid out in the Ontario orthotics claim process.

When to have it looked at

Training exposes things that walking hides. Worth booking an assessment: a device that was fine on the street but causes pressure in the gym, one side feeling different from the other, arch or heel pain that returns partway through a training block, or a top cover worn through over a shell that has visibly flattened. A worn out device is a different problem from a wrong one, and telling a refit from a replacement covers that distinction.

The appointment itself is not mysterious. History, a look at how you load the foot standing and moving, your shoes on the table, and whatever devices you already own. What to expect from a biomechanical assessment walks through it, and what gait analysis shows covers the movement part. If all of this is new and you have no devices yet, start with our overview of custom foot orthotics in North York.

Frequently Asked Questions

Is it a problem to lift barefoot or in socks at home?

For most healthy feet, short sessions of flat barefoot lifting are not a concern, and some people prefer the feedback from the floor. It is a different matter if you live with diabetes, reduced sensation, a current wound or a painful forefoot, where barefoot work on a hard floor is not worth the risk. If pain is the reason you own orthotics, do your loaded work in a shoe.

My training shoes feel too tight once the orthotic goes in. What should I change?

Remove the factory insole first, then loosen the laces over the instep. If it is still tight, the shoe is the limiting factor rather than the device. Custom devices versus store bought insoles explains why the two sit so differently inside the same shoe.

Do I need a second set made just for training?

Not usually. Raise it if your training shoes are shaped very differently from your everyday pair, or if a bike shoe or a court shoe cannot physically take the devices you have.

How long should a new pair take to feel normal during a workout?

Build up over a couple of weeks instead of wearing a new pair straight into a hard session, and expect to notice the device early on. Sharp pain, numbness or a blister is not part of settling in and is worth a call.

Will leaning on a device at the gym leave my feet weaker?

Wearing a support is not the same as losing strength, and there is no good evidence that an orthotic prescribed for a reason makes a foot deteriorate. You can train foot and calf strength alongside it. Whether foot strengthening exercises work looks at what the research actually supports.

Indoor training through a Toronto winter goes better when your devices and your shoes are not working against each other. If yours are, book an assessment at Donwood Foot Clinic and bring the gym shoes with you.