Question

why do we feel tired after heavy exercise

Answer 1

We feel tired after heavy exercise becoz Lactic is what causes muscles to burn after exercise. Lactic acid form as a by- product of energy production by the muscles. Muscles fibers convert glycogen which is formed from glucose to ATP or adenocine triphosphate.

Answer 2

After heavy exercise lots of energy of our body is used up so we feel very tired and hungry tooo