I TOOK 200MCG OF CLEN,OOPS COULDNT EVEN TALK ON THE PHONE WITH OUT CATCHING MY BREATH. THOUGHT I WOULD GIVE A LITTLE EXTRA KICK DURING CHEST BUT I DIDNT START UNTIL I CAME DOWN A LITTLE. THEN TOOK A RED BULL AND A THERMO AND A CAFFEINE PILL AND HAD A GREAT CHEST WORK OUT.