Great question! A drop set is a resistance training technique in which you focus on completing a set until failure — or the inability to do another repetition. Then, you lighten the load by 10–30%, and repeat, with little to no rest in between sets. You’d start with a heavy load, one in which you can only complete 6–8 reps. Let’s say that’s 20-pound dumbbells. You’d do 8 reps of bicep curls with 20-pound dumbbells, then 10–12 reps with 15-pound dumbbells, then 12–15 reps with 12-pound dumbbells. You’d take little to no rest between sets.
Paying attention to your form during each rep is always important, but it’s especially key during a drop set when you’re working to fatigue. This can help prevent injuries.