Single-set training is performing just one set of repetitions per exercise in your training session. In multiple-set training, you perform more than one set of reps per exercise.

Is 1 set enough?

What's better for strength training — one set or multiple sets? Answer From Edward R. Laskowski, M.D. For most people, a single set of 12 to 15 repetitions with the proper weight can build strength and improve fitness as effectively as can multiple sets of the same exercise.

Is 1 set better than 3?

If everything else is kept equal 3 sets are better than 1 set for hypertrophy and strength when training the lower body, even in untrained individuals. But for some reason, in untrained individuals 1 set seems to be just as effective as 3 sets for upper body training –- at least for the first 11 weeks.