"Training volume" refers to the amount of physical activity or exercise you do during a training session or period. It measures the quantity of work you put in, such as the number of repetitions, sets, or duration of your training.
When fat - loss is your goal you are often in a caloric deficit, usually by a combination of increased training volume and reduced calorie intake. (sciencedrivennutrition.com)
I slowly built up my level of training volume focusing on anaerobic activities because the whole magic of metabolism in my view is when glycogen stores are not completely full. (drrosedale.tenderapp.com)
As a result of doing the same effective training program, there were no significant differences between the groups in total training volume or any of the other categories. (onnit.com)