What can I do to stop being tired after working out?

WORK A HALF HOUR LONGER, BUT SLACK OFF AND NOT WORK OUT HARD OR FAST, GO THROUGH THE MOTIONS WITHOUT SWEAT OR SIMPLY CHANGE YOUR FINAL 1/2 HOUR TO MOTION WITHOUT STRENGTH. A SLOW DOWN MODE. IF YOUR A RUNNER THEN SLOW DOWN ON THE LAST 1/2 HOUR, SO YOUR NOT TIRED.