can i walk on the beach in the summer

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hi all, im Gary, this working out stuff is all new to me , was always told from a young age i would be small, but would love to put on enough weight so i can walk around with no top on with out feeling embarrassed or my kids saying dad put ur top on.,
only need to put on 40 lbs.
Started the insanity workout, and was told about this site so i could keep track on my daily intake.
Tried just stuffing my face from morning till night but nothing seems to work, so im trying this, nothing lost if it doesnt work