Push Your Limits
To grow large, your body needs to become comfortable with heavy loads. "That's why I had Taylor 'taste' a much heavier weight," says Yuam, who would stack a bar (or use dumbbells) with about 40 percent more weight than Lautner could normally lift 10 times.
So if you can lift, say, 120 pounds 10 times, go with 170 pounds. Then, using a spotter, perform only the lowering half of lifts. ("It's critical that your spotter be strong enough to lift the weight back up by himself," Yuam says.) For a bench press, that means slowly lowering the weight to your chest. This lets your body adjust to the new weight even before you're ready to raise it. The move is taxing on your muscles, though, so limit your "tasting" to 2 or 3 sets of 5 reps every other week.
Source: Men's Health