What is a high impact sports bra?  Why do I need one?

CHANGE THIS COPIED FROM https://www.hunkemoller.co.uk/sport/sports-bra-running Which sports bra should you wear for running? Since running is an intensive sport we always recommend to choose a sports bra that offers maximum support. This advice applies to both women with bigger boobs and smaller boobs. As too much support can’t do any harm, but too little support can. With us these sports bras are the level 3 sports bras for high impact sports. Level 3 sport bras are especially designed to offer your boobs the most support. LEVEL 3 SPORT BRAS