Take it before cardio,reduce the dose to one tab/day if you felt palpitations during or after working out,then increase by 1/2 a tab every otherday,make sure not to take any anihistamenics along (eg. claritine,telfast or zyrtec)nor antiacid medications (h2 blokers like zantac)........................................... .........

The half life of clen is 12 hours sir,so kindly check your info.