This is a complicated question! If you just go to the gym for a bit of sweat, a pre-workout can not bring much benefit. However, if you are someone who wants to turn serious training into serious results, a pre-workout can be helpful. For example, suppose you have four weeks ahead of Jim Stoppani, Ph.D.'s shortcut to shred program, and you know you need a boost to survive a cardiac acceleration day. You are hungry and sore, but the training must be completed! This is the mindset that leads many to the first pre-workout.
Anyone in the gym looking for an energy boost or an ambitious PR is the first candidate for a pre-workout supplement. Despite the best preparations in your sports bag, the best benefits over time are achieved through consistent training, continued use, adequate nutrition and adequate rest and recovery.
There's a good reason why Physiotherapist Krissy Kendall, Ph.D. ., contains the basic ingredients of pre-workout caffeine, BCAAs, citrulline malate and other NO boosters on their list of the "8 Best Supplements for Strengthers and Bodybuilders".
If you know you are high in caffeine, you may benefit more from a low-stimulation or stimulant-free pre-workout. Since many pre-workouts contain stimulants, some of which contain many stimulants, first ask your doctor if you have health problems that may cause side effects.
Parents should also be careful when giving a stim-heavy pre-workout for teens, and no, they are not a good idea for young kids. If your child is being trained seriously, tell them that they should be able to motivate themselves, go to the gym first, and work hard. The intensity-enhancing additions can come later, after building a solid foundation.