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Negatives are done by lowering a weight that is heavier than you can lift. Negatives should be done in a power rack for bench press, squats, overhead press, and lying tri-extensions. All other exercises can be done on a bench. Negatives should be done on the last set of an exercise, when you are completly warmed up.
If you can bench press 250 lbs., on your last set put 300 lbs. on the bar and just slowly lower the bar to your chest and have a spotter lift it off.