You can do anywhere from 3-6 sets in total. One of the most popular types of drop sets is “down the rack” dumbbell bicep curls where you start off at a normal curl weight and move down the rack, going to failure on each set. Switch the days you work each muscle. Changing the order of your workout days can have a big impact on results. In general, you should work your weakest muscle groups at the beginning of the week when you have the most energy.