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A session is one workout, as in a weightlifting session. A session usually contains more than one exercise and more than one set, but it doesn’t have to. Your training routine will include a certain number of sessions per week, from one to up to four or more if you’re an experienced weight trainer.
You can also keep track of the total volume lifted in the session, day, or week, or even within a time period (say, in a set of bench presses with short rests between each rep). Volume is the total amount of pounds or kilograms you lifted during an exercise or a session. For example, if you did 10 reps of bench presses at 150 pounds, the volume was 1,500 pounds.