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Message: [QUOTE="DSsuper92, post: 233991, member: 17793"] From Muscle Media 2000: "A burn is simply an accumulation of lactic acid, a by-product of chemical respiration. You can get a burn by peddling a bicycle or simply extending your arm straight out and moving it in tiny circles. It does not necessarily mean you are promoting muscle growth." That burn that you feel is your cardiovascular system telling you that it's not quite up to whatever you're doing. [/QUOTE]