Try a circuit. Break up your weight lifting routine with bouts of aerobic activity. Do a set of bench presses. Keep repeating this cycle until you're done with your weight workout. Get with a group.
Most gyms offer groupstrength training classes.
The upbeat music and group energy make the time fly. If your gym doesn't offer such classes, or you prefer to work out at home, try a video. Pay attention to your body. Look in the mirror and watch your muscles work. When possible, put your hand on the muscle that you're targeting, and feel it contract and relax.