I had a personal training for a while and he would mix in what he would call "negatives" that were exactly that. For example, we'd set up in a bench press and h

I had a personal training for a while and he would mix in what he would call "negatives" that were exactly that. For example, we'd set up in a bench press and he'd assist in lifting the bar up, then it was on me to slowly lower it back down. According to him, you're able to use your strength more effectively going down, so I was actually able to do more than I could normally bench this way. Similar story with concentration curls.