at the gym today, i was weighing myself (239lbs) when a girl whom i have spoken with a few times (shes a trainer...) comes up to me and says "you shouldnt weigh yourself during or after lifting" something about being heavier because of producing more blood and muscles retaining water. i said "if there is nothing coming IN OR OUT of my body, my weight will not change" obviously i would weigh more if i was chugging water during my lift, but i hadnt even had a sip. she didnt buy what i was saying and i wanted to beat her mercilessly...
has anyone ever heard anything about this terrible theory?

has anyone ever heard anything about this terrible theory?