As a fitness girlie with a particularly large bust, finding sports bras can feel like a sport in itself. Every few years, I wear out the ones I own, hunt high and low to find a style I like, buy several, and wear them into the ground—then the cycle repeats itself. It’s always been a particularly frustrating part of shopping for me and my 38DDs (DDD, depending on the brand).
Recently, I found myself once again on the hunt for my next emotional support bra. This time, I decided to try my luck with the Women’s Health 2026 Fitness Award winner and best sports bra overall: the On Performance Flex Bra. Here are my honest thoughts.
As a fitness editor and trainer, I’m constantly changing up my workouts. I tested this bra during heavy strength-training sessions, runs, and some athletic conditioning workouts including box jumps, kettlebell swings, and hurdle bounds. I wore it to coach some of my strength classes, and I also ran some errands around town with it to see how it handled everyday activities.
One of the biggest advantages of this bra is the adjustable straps. For high-impact activities, like running and athletic conditioning, I could tighten it up for extra support. When I was only lifting or running errands, I could loosen it a bit to give myself some more flexibility and comfort.
The best part: the straps stay put no matter what you’re doing—no loosening during jumps or runs. My only complaint about the fit of this bra is that it runs a bit tight around the ribcage. I have a particularly wide ribcage—again, I’m roughly a 38DD—and the underband was a bit snug in the size XL, the largest size they offer.
It wasn’t so unbearable that I couldn’t wear it for long stints of time, and the fabric’s stretch definitely helped. Still, I felt some relief taking it off at the end of the day. One complaint I often have with sports bras for larger busts is that they tend to have super restrictive necklines.
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