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Woman wearing a high-support sports bra during a workout

Breast Size, Support, and Fitness Gains: What the Newer Science Says (and How to Use It)

Breast Size, Support, and Fitness Gains: What the Newer Science Says (and How to Use It)

If your chest has ever made workouts uncomfortable, you’re not imagining it. A landmark 2019 study that precisely measured breast volume in 355 women found a clear pattern: as breast size increased, overall physical activity—especially vigorous exercise like running—tended to drop. Crucially, this effect held even after accounting for age and BMI.

Since then, research from 2022–2025 has filled in the “why” and, more importantly, the “what to do about it.” Here’s a quick look at the updated science—plus practical strategies you can use right now to turn better support into real fitness gains.

August 15, 2025 — Matthew Gawors
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