I'm not a runner but I am athletic. Most of all, I'm over 50, have 3 young children, work at home and at an office, in the garden, work out at the gym, and crave all-day comfort. This bra not only feels great and looks good under clothes, it supports my 38C shape and additionally, acts somewhat as a camisole under tops/dresses that are a bit too low. There is no flattening or compression if you buy your true size. Conversely, there is very little noticeable bounce. I got the Fiona bra in white (no see-through, girls) and reach for this bra consistently to create modesty under things bought in my younger days. Now I have a large scar and more wrinkly-looking breast skin (talk about letting it all hang out in a review) and Fiona helps me preserve some dignity.
While I never sleep in a bra, this one offers complete joy in the comfort department. I am one of those women who wants to rip off my bra the moment I get home from work and I don't even buy underwire bras. I am so happy to have purchased this bra. I wish I had purchased 3 in different colors.