Pretty much all the places mentioned already (though Bev’s gym is in Syosset, not Manhasset). I’d also double-check this thread, but it’s from 2009 so make sure the places are still around.
Shawna Mendelson, sister of Scot, has Blue Collar Barbell in Bohemia and it looks about 15-20 minutes from Hauppauge. Maybe contact them to see how to head over there. From a quick look at their site, they might be a private facility.