He was about 60kg (5'9" tall) when I met him 5 years ago and he has quite the paunch now
Its actually not helpful being half the size of a big burly bloke if you're trying to do renovations. The two lads who ripped up our floor and did our kitchen - now
they were strapping young lads (reasonable eye candy too) and would have easily weighed 30-40kg more than the other half just in being bigger builds with a lot more muscle, not a huge amount taller either. The plumber we had out was much the same build and was just tossing around stuff outside that we couldn't even budge!
You want underweight on a man, my ex got down to ~70kg when we broke up donkey's years ago. He is 6'2"