Thank you for putting it into perspective.  I was wondering about the speed of the reps too, but when compared to standing mass, this tubby is actually burning less just by being on his back.  What a scary thought. Half reps are ok, and in fact appropriate in this case.  His bulk actually gives him good form because he can't go past a 90 degree angle at the elbows with that gut.  But honestly, unless he lays off the beetus drink and mayo, all the gym work in the world ain't gonna make a difference at this point.  He'd make faster progress by burning his fridge.