Which type of periodization is generally only performed with athletes and well-conditioned clients?

Overreaching is a type of periodization characterized by intentional temporary increases in training volume and intensity to push an athlete beyond their regular threshold. It is specifically designed to enhance performance by creating a state of fatigue that can ultimately lead to supercompensation, where recovery results in greater performance gains. This method requires a well-conditioned body capable of handling and recovering from significant stress, making it most suitable for athletes and those with advanced fitness levels.

In contrast, linear periodization typically involves a gradual and predictable increase in intensity and decrease in volume over time, making it more suitable for general populations or beginners. Non-linear periodization features varied intensities and volumes in training sessions, providing flexibility but still typically caters to a wider range of fitness levels. Cyclical periodization also includes varied intensity and volume, but it is often structured over longer periods and is also applicable to various fitness levels. Thus, the specialized nature of overreaching makes it distinct to athletes and those in peak conditioning.