Can we truly rely on self-assessed progress in cycling when the data points were using - power output, heart rate, and perceived exertion - are inherently flawed and influenced by a multitude of external factors, including bike fit, nutrition, and recovery strategies, or are we simply kidding ourselves that we can accurately track our progress without the guidance of a coach who can provide objective analysis and correct any flaws in our training methodologies, and if so, what are the limitations of self-assessment and how can we mitigate them to ensure were not plateauing or worse, regressing despite our best efforts, and is it even possible to develop a reliable system of self-assessment that can rival the expertise of a seasoned coach.