If the bar goes up even during, for example bench, incline or preacher curl, an exercise does this mean that both sides of the body are being worked at the same time. Last week I was having a problem with Incline bench when I would do the reps normal my left arm would be higher and then my right side. But when I tried to keep the bar even if felt like I was only lifting with my right side and felt practically nothing in my left side. My spotter said that when I when to full extension my left arm was higher. Please help with explaining some solutions. Thanks