[zDevon]

Check out these. For other objects I'd use http://gamerxserver.com/forum/index.php?topic=336.0 as a source, surprisngly enough I couldn't find gym objects there though.

Quote:

Originally Posted by SAMP Wiki 3071 = dumb bell right 3072 = dumb bell left 2627 = treadmill 2628 = bench 2 2629 = bench 1 2630 = bike 2913 - gym stuff (also 2915, 2916)

Edit: if you're using the SAMP editor, search here for the gym interior and set your editor camera to the coords given there. You'll be in the gym and can double click any object there for the ID.