We have a driveway more than big enough for the two cars, so the garage is merely extra living space. This is where my power rack and weight set goes. A power rack allows for benching and squatting without spotters.
Also there is a TV out there with a PS2 hooked up for Guitar Hero. Not much room besides all this. There is also a computer with a subwoofer speaking hookup, as well as guitar and amp. My tiny little house is 1030 Sq. foot with two kids, coming from 2400 Sq feet plus a 1200 sq foot basement in Ohio. We got rid of a lot but not everything.