I don’t do weights… I do camera’s with top end lenses, weighing in at around 2.5kg – that’s around five and a half pounds. Around an hour and forty-five minutes of waving that lot around has to be good for me? right! 
Oh, and I do occasionally bop myself in the eye socket if responding to a fast piece of unexpected action (fortunately the eye-piece has a soft rubber surround to cushion the blow)
I hope everything is going well after the rehab and you are getting stronger all the while 
I think I might just have a go at my wife’s weights!