The most important thing to remember in exercise is to breathe. Remember to practice safety while weight lifting. Keep dumbbells in a safe place, so people won't trip over them. For your own safety, as well as to help motivation, Tackett suggests having a spotter. A spotter is important not only for safety reasons, but also for performance enhancement.
Few things work as well as a conscientious, knowledgeable spotter.
The best workout partner demands proper technique and full effort on every exercise set and repetition. An effective spotter gives encouragement, technique, feedback, and enough assistance to allow completion of that final, difficult, repetition. Tackett states that no matter the goal, each set should end with the last repetition being difficult enough to reach muscle fatigue. Given this goal, there is always a chance that the final repetition, can't be completed alone. This is when the spotter comes in.