What is the general outcome of performing more than 15 repetitions in resistance training?

Performing more than 15 repetitions in resistance training generally promotes endurance rather than hypertrophy. This is because higher repetition ranges typically lead to a greater emphasis on muscular endurance, which is the ability of muscles to sustain prolonged activity. When the focus is on performing many repetitions, the resistance (weight) used is generally lower, allowing the muscles to work for extended periods without fatiguing quickly.

This training style primarily recruits slow-twitch muscle fibers, known as type I fibers, which are more efficient for endurance activities. In contrast, lower repetition ranges (usually between 1 to 6 reps) are more conducive to hypertrophy (muscle growth) and power development, as they involve heavier weights which stimulate fast-twitch muscle fibers (type II fibers) responsible for strength and explosive movements.

In summary, the outcome of performing more than 15 repetitions is an increase in muscular endurance, making option B the most accurate choice regarding the effects of high-rep resistance training.