The speaker discusses the strategy of gradually increasing body weight to enhance strength and performance in weightlifting. By gaining half a pound to a pound per week over a period of 12 to 16 weeks, followed by a 6 to 8-week period of leaning out, individuals can effectively increase their body mass and, consequently, their lifting capacity. This approach is particularly beneficial for pressing movements such as overhead press, incline press, and bench press. The speaker emphasizes that increasing body mass is a straightforward and effective method to boost lifting performance, as it often leads to an increase in the weights one can lift. This strategy is supported by common advice found in weightlifting communities, which suggests that gaining weight can lead to significant improvements in exercises like the bench press.