Great tip Fern.

Many people under-utilize the "negative" portion of their lifts.

I am using this technique in my current training cycle: I lift the weight (positive) as fast as possible (of course, it's under control and in good form), and take 2-3 seconds to do the negative. It's called Explosive Training, but it does emphasize the negative.

Also, a good technique for busting through a plateau on the bench press is using negatives. On your last set, load the bar with 20% more weight than you know you can handle (a.k.a your "max"). Keep a spotter/training partner nearby.

Lower the weight for a full 6 count, then try to lift it. Of course, you won't be able to, and your lifting partner will have to help you ... but you just placed an enormous amount of work on you muscles by doing that sustained negative, and your body will respond by getting stronger.