A quick note about bras: While sports bras promise different levels of support, the terms are relative to breast size. Sports bra ratings are based on larger cup sizes, so women with A or B cups might find that a bra labeled “low-impact” actually provides enough support for high-impact activities; women who wear larger cup sizes will likely find that bras feel true to their ratings.
If you're looking to replace your old sports bra, make sure to try on a new one before you buy it and get fit for a bra by a professional if you're not sure what kind will work best for you.