Changing a workout routine every 4 to 6 weeks is generally advisable to see continued progress. This modification helps to prevent plateaus, where the body becomes accustomed to specific exercises, leading to diminished results. By altering the training stimulus, individuals can challenge their muscles in new ways, promoting growth and development. Additionally, changing routines can reinvigorate interest and motivation, reducing workout boredom. Incorporating different exercises, intensities, or training styles not only enhances overall fitness but also contributes to a more enjoyable and sustainable workout experience for long-term success.