Man boobs are fat. Just in the same way as any excess body tissue is. WFPing wont get rid of man boobs. That doesnt mean to say WFPing wont tone you up, it certainly does on your upper arm and shoulder muscles; but you need aerobic exercise to lose excess fat.
Imagine this. You have a pot belly. Do sit ups wont get rid of it, that'll simply tone up the muscles underneath the fat. Like I say its aerobic exercise you need to lose fat. But you may find you tits are the last place it comes off, even if its the first place you noticed it 
man boobs arnt fat, its excess breast tissue. usually caused when tetesterone boosted rapidly causing natral mane estrone to balance to a natural ratio to teteserone. when the tetesterone fall RAPIDLY to it natural level esterone falls SLOWLY to its natural level resulting in an imbalance.
another factor can be in the tap water we drink being contaminated by women who take the pill (esterone gets in the water)
other causes can be
tetestorone boosters either from vitamines like zinc or roids
i tried years to get rid of them they appeared as fat but the litle fat i had just sat on top of the tissue