• When spotting someone, who is using a barbell, be sure to use two hands and provide assistance evenly on the bar so you don't throw off their balance or favor one side more than the other.
• When spotting someone, who is using a dumbbell, be sure to provide assistance in the same place for both hands and the same amount of assistance on each side.
• When spotting someone who is using a machine provide assistance underneath the weight--be sure to move hands on the negative phase (down phase with resistance) not only to promote effective results for the lifter but also to assure your safety.