We feel tired after regular exercise. ( give scientific reasons).​

It's common to get tired after a long or tough workout. In general, this occurs because your muscles run out of energy. Your central nervous system also loses its ability to keep moving your muscles. This causes muscle fatigue, making you feel tired.

and how is ur raj and long time no talk.

are u ok

answer///cannot be totally predicted;

hmmm

true, i think.

i checked and it seems the answer is, true.