Which of the following training methods is least effective for roller derby?

Weight lifting is considered the least effective training method for roller derby primarily because roller derby is a dynamic sport that heavily relies on skills like agility, balance, and endurance, rather than just raw strength. While strength training does play a role in overall fitness and can contribute to a player's power on the track, it does not specifically enhance the skills needed for roller derby, such as skating speed, maneuverability, and the ability to navigate through opponents.

In contrast, interval training, regular cardiovascular training, and practicing skating techniques directly target the required skills and physical demands of the sport. Interval training boosts short bursts of speed and stamina, which are crucial during gameplay. Regular cardiovascular training builds endurance, allowing skaters to maintain high energy levels throughout a match. Practicing skating techniques works on the specific skating skills necessary for effective gameplay, improving both performance on the rink and the ability to respond to game situations effectively. Thus, while all training regimens can have their place, weight lifting is not the most effective choice for developing the unique skill set needed in roller derby.