Just keep spinning, just keep spinning. It might be an endurance climb up and down country lanes, or a fast-paced Psycle session, but an unsupported pair might just knock you off balance. Avoid the chafing effects of repetitive movement by ensuring you have a medium to high impact sports bra with seam free cups like Anita DynamiX Star or the triaction Hybrid Lite, both have racer-backs to keep your shoulders free for movement too.