to reduce belly fat you have to workout and diet which you allready know.. but only workout that repeatedly flexes your solar plexus and belly muscles will burn out more fat than doing allbody workouts.. I was an obese with 31 BMI.  I reduced it by 5 in last 6 months and the most workout sets I have done are crunch and situp.. and followed a diet of reduced sugar and high fiber carbs. helped me a lot.