That should depend on your client or patient you are working with. Everyone has the number “3” engrained as for how many sets. However, research has shown that 1 set verses 3 sets produced no significant benefit. (Chris Haus from UF). However, that does not mean I just perform one set of a particular exercise. Although it is good to keep in mind considering it is difficult enough getting clients to train, let alone for in a desired time frame.