Bio-Cycles are a theoretical concept that suggests our daily lives are significantly influenced by underlying, innate biological cycles. These cycles regulate our physical, emotional, and intellectual capabilities, beginning at birth and continuing with perfect rhythm throughout our lives. Proponents of the theory believe that by charting these cycles, one can predict periods of high performance, low energy, and critical days of heightened risk or opportunity. The core Bio-Cycles model is based on four classic cycles, with a fourth, "Intuitive" cycle, added in modern interpretations. Each cycle is represented by a sine wave, oscillating between high (positive) and low (negative) phases, with a critical transition point where the wave crosses the zero line.