Runderwear Women's Support Running Bra (£45) is specifically designed for runners (which I am not, but I can still see a fit for it in my fitness attire), by providing maximum support with the adjustable straps, J hook fastening, racer back, and removable pads. This bra has it all and truly supported me in an intense workout. It supported me so much, that it was actually a struggle to take off at first because I forgot it has so many fastenings. It's tight-fitting, supersoft, and is the bra I will count on when I need something for very high-intensity workouts (or maybe just for skipping when I'm feeling less energetic!)
Image Source: POPSUGAR Photography / Tori Crowther