What they are: Three or four sets of one exercise performed without rest, using a lighter weight for each successive set. Also called descending sets or strip sets.
Why they’re useful: Drop sets are a great quick workout, fatiguing your muscles in a short time, getting your heart going, and giving you an impressive postworkout pump as your muscles fill with blood.
How to use them: Use drop sets when you’re pressed for time. Don’t do them more than three times a week; you’ll get so tired you won’t be able to accomplish much else. Start with a warmup, using 50 percent of the weight you expect to use in your first set. Now use the heaviest weight you’d use for eight repetitions of that exercise to perform as many repetitions as you can. Drop 10 to 20 percent of the weight and go again. Continue to reduce the weight and go again, always trying to complete the same number of repetitions (even though you won’t), until your muscles fail.