EVERYDAY SCIENCE

Detailed explanation-1: -Essentially, the phrase is saying, “Enjoy the pain! Suffer through your workout! Keep going even if it hurts!” A healthy fitness regimen should not be framed negatively. Exercise should be enjoyable, not something you feel like you have to do.

Detailed explanation-2: -This burning sensation is associated with a buildup of acid in the muscles during intense exercise, and lactic acid has long been thought to be the culprit in that acid buildup, known as acidosis. Lactic acid is a byproduct of anaerobic metabolism, in which the body produces energy without using oxygen.

Detailed explanation-3: -Lactic acid fermentation is the process by which our muscle cells deal with pyruvate during anaerobic respiration. This happens when we exercise too fast or hard because the oxygen supply can’t keep up with the need. That’s when our muscles switch from aerobic respiration to lactic acid fermentation.

Detailed explanation-4: -Lactic acid fermentation has two steps: glycolysis and NADH regeneration. During glycolysis, one glucose molecule is converted to two pyruvate molecules, producing two net ATP and two NADH.