Doing drop sets helps you do more reps with the same weight better than regular sets.
Evidence from Studies
Supporting (1)
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Effects of drop sets with resistance training on increases in muscle CSA, strength, and endurance: a pilot study
The study found that doing one heavy set followed by lighter sets without rest (drop sets) helped people do more reps with a light weight, just as well as doing many light sets — and it took less time.
Contradicting (2)
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Rest-pause and drop-set training elicit similar strength and hypertrophy adaptations compared to traditional sets in resistance-trained males.
This study looked at strength and muscle growth, not how long you can keep doing reps with lighter weights—so it doesn’t tell us if drop sets are better for endurance.
The study found that doing drop sets didn’t help people do more reps or get stronger than regular weight training when both used the same total workload — so drop sets aren’t better for endurance.