The competitive nature of sport encourages some participants to attempt to enhance their performance through the use of medicines, or through other means such as increasing the volume of blood in their bodies through artificial means
Kuchita bwino kwambiri kwa poyerekezana ndi zina kwa masewera olimbitsa thupi kumalimbikitsa otenga mbali ena kuyesera kupititsa patsogolo machitidwe awo kudzera mukugwiritsa ntchito mankhwala, kapena kugwiritsa ntchito njira zina ngati monga kuwonjezera magazi mu thupi lawo pogwiritsa ntchito njira zina zopangidwa ndi anthu. 