The Importance of Proper Fitting Sports Bras
The Importance of a Proper Fitting Sports Bra
Let's talk about the single most overlooked piece of gear in your closet: your sports bra. You've invested in a gait analysis, you've found shoes that actually fit, you've got the right socks—but if your sports bra isn't doing its job, every mile is working against you. At Athletic Annex, we believe gear that fits isn't just about your feet. It's about your whole body moving with confidence, from your first 5K to your next marathon finish line.
Whether you're lacing up for a weekend group run or chasing a new personal best, a properly fitted sports bra is foundational—not optional. Here's why it matters so much, and how to make sure you're getting it right.
Why Fit Matters More Than You Think
Breast tissue has no muscle to support it—it relies entirely on ligaments (called Cooper's ligaments) for structure. Every time your foot strikes the ground while running, your chest experiences movement, and research has shown that unsupported breast movement during exercise can be significant, even for women with smaller busts. Over time, repeated, unsupported movement can stretch those ligaments, which is a change that cannot be reversed with exercise or time.
Beyond the long-term tissue health concerns, an ill-fitting sports bra can cause:
Chafing and skin irritation from straps or bands that rub during longer runs
Back and shoulder pain from bands that ride up or straps that dig in
Restricted breathing from bands that are too tight
Distraction and discomfort that pulls your focus away from your pace, your breath, and the joy of the run itself
In short: the wrong bra doesn't just feel bad—it can hold you back from performing and recovering at your best.
Signs Your Sports Bra Isn't Fitting Right
Many of us have been wearing the wrong size for years without realizing it. Here are some telltale signs it's time for a refit:
The band rides up your back instead of sitting level
You can fit more than two fingers under the band when it's hooked on the loosest setting
Straps dig into your shoulders or slip off during movement
There's bulging or spillage at the cups or underarms
You feel like you need to "adjust" mid-run
Sound familiar? You're not alone—studies suggest a large majority of women are wearing the wrong bra size. The good news is that it's an easy fix once you know what to look for.
Understanding Support Levels
Just like shoes are built for different distances and gaits, sports bras are designed for different impact levels and activities. Choosing the right support level is just as important as choosing the right size.
Low Impact
Best for walking, yoga, strength training, or recovery days. These bras prioritize comfort and a softer, more flexible feel.
Medium Impact
Great for hiking, cycling, or moderate-paced training runs. These offer more structure and compression while still allowing a full range of motion.
High Impact
Essential for running, especially tempo runs, race day, and any high-intensity interval training. High-impact bras use a combination of compression and encapsulation (sometimes both) to minimize movement in every direction—not just up and down, but side to side as well.
If you're training for fall marathon season or logging summer base-building miles, don't underestimate how much a true high-impact bra can change the way your runs feel.
How a Proper Fitting Actually Works
We get it—bra shopping can feel intimidating, especially if you've never had a professional fitting before. Here's what to expect (and why it's worth it):
Band first. The band should sit snug and level around your ribcage, providing the majority of your support—not the straps.
Cups should fully contain without gapping, puckering, or spilling over the edges.
Straps should stay put without digging in, even through dynamic movement like jumping jacks or a light jog in place.
Movement test. A good fitter will have you move—raise your arms, jog in place, twist—to see how the bra performs in motion, not just standing still.
This is exactly the kind of personalized attention we bring to every fitting at Athletic Annex. The same way we use expert gait analysis and 3D foot scanning to find your perfect shoe match, our team takes the time to make sure your apparel actually supports the way you move—because every runner, walker, and mover is built differently, and your gear should reflect that.
Brands and Options Worth Knowing
We carry a curated selection of performance and lifestyle apparel designed to keep you comfortable at every pace, including pieces from lululemon, Vuori, Brooks, and more, alongside our own Athletic Annex branded apparel line. Whether you want something built purely for performance or a crossover piece that works just as well for a group run as it does for errands afterward, we've got options that fit your life—not just your workout.
"I didn't realize how much the wrong bra was affecting my runs until I got properly fitted. It was like running in a completely different body." — a sentiment we hear all the time from our community.
Make It Part of Your Routine
Just like running shoes lose their cushioning over time, sports bras lose elasticity and support—typically after six months to a year of regular wear, depending on frequency and care. A good rule of thumb: if it's stretched out, faded, or just doesn't feel as supportive as it used to, it's time for a refresh.
And remember, fit can change. Weight fluctuations, training cycles, and even which season of training you're in (hello, marathon block) can all affect what size and support level work best for you.
Ready To Learn More?
Join us at our Carmel Clay Terrace location for The Ultimate Support Group on Tuesday, October 13 at 7pm. Brooks Running will be on hand with Bra demos so we can help you find your perfect fit! We will have charcuterie and wine, a special guest speaker, and of course the opportunity to get properly fit for a new sports bra! Bring your older, gently used or even those new bras that didn't work out for you to donate to I Support The Girls and receive a special discount on your new bra purchase!
Shop All Sports Bras
Come See Us
At Athletic Annex, we've been locally owned since 1983, and our mission has always been to empower our community to live happy, healthy, active lives—one person, one day, one step at a time. That includes making sure you have the gear that fits, from the ground up. Stop by for a fitting, join us for a free group run, and let's get you moving with the confidence you deserve.
