Volume and intensity are linked; as intensity increases, the volume that a lifter can perform must decrease. By definition, a lifter cannot perform their one-rep personal record for many sets or reps. In contrast, when intensity decreases, volume must rise to give enough stress on the lifter. For example, if a person's one-repetition maximum (1RM) is 200 pounds, then they could probably do three 10-pound lifts before passing out from exhaustion. However, if their 1RM was reduced to 100 pounds, then they would need to lift 30 times to reach the same level of fatigue. As another example, assume that someone can squat 150 pounds. They might be able to complete six repetitions at this weight without any problem. If the load were increased to 175 pounds, then they would have to reduce the number of repetitions they performed to four in order to achieve the same level of fatigue. Finally, if the person's goal was to improve their performance and they wanted to go for their one-rep max, then they would have to reduce the amount they loaded themselves so that they could sustain one full repetition over time. In general, volume is simply the amount of work you do during a given period of time. So, the more work you can do in a given amount of time, the more volume you can handle simultaneously or in succession. Intensity is how hard you push yourself during a set or rep range.