I heard a litre of of water weighs a pound and a quarter!
I got a 1.5 pound gain on what was like the strictest week id ever had cos I drank litres and litres just before (I needed to give a wee sample at the doctor ha)
To be honest I don't think my groups amazing, I just come every week to have everyone be mesmerised by my losses when I get them hahaha none of them take it that seriously and are constantly losing and gaining tiny amounts. I know I'm essentially doing the same but in larger amounts