A drop set is an intensity technique where you take a set to failure or close to it, immediately cut the weight by around 20 to 30 percent, and keep repping without resting. You can drop once or twice per set. It packs a lot of hard, effective reps into very little time, at the cost of a sharp spike in fatigue.
Why it matters
The research is fairly consistent here: drop sets produce muscle growth similar to traditional straight sets, in roughly half the gym time. That's the appeal. The trade is fatigue. Every drop pushes you past failure again, and that kind of work leaves a mark. Soreness lingers, recovery slows, and the next session can suffer. So drop sets earn their place as a time-saver and a finisher, not as the foundation of a program.
How to use it in training
Use them on the last set of an exercise, on isolation or machine movements where failing is safe. Lateral raises, leg extensions, cable curls, pec deck. Rep to near failure, strip 20 to 30 percent, rep again, and stop after one or two drops.
Once or twice a week per muscle group is plenty. And skip them entirely on squats, deadlifts, and heavy presses: failing under a barbell with cooked muscles is how form falls apart. Short on time? A drop set turns three sets of work into one. That's the moment it shines.