Is it really worth the hype to ditch the gym membership and solely rely on bike commuting for overall fitness, considering the varying intensity levels and lack of structured workouts, or are we just romanticizing the idea of cycling to work as a viable substitute for a well-rounded exercise routine, and if so, what specific physiological benefits can be realistically expected from incorporating bike commuting into ones lifestyle, and how does it compare to other forms of exercise in terms of caloric burn, cardiovascular benefits, and muscle development, and what are the potential drawbacks or limitations of relying solely on bike commuting for fitness, such as inadequate strength training or neglecting other essential aspects of physical fitness, and can anyone provide concrete evidence or scientific research to support the notion that bike commuting is a sufficient replacement for traditional forms of exercise, or are we just pedaling on anecdotal evidence and hearsay, and if bike commuting is indeed a viable substitute for the gym, what specific tips or strategies can be employed to maximize the fitness benefits and ensure a well-rounded workout, and how can one avoid plateaus or prevent overuse injuries when relying solely on bike commuting for exercise, and what role does nutrition play in supporting a bike commuting-based fitness routine, and can anyone provide guidance on how to properly fuel and recover from regular bike commutes to optimize overall fitness and well-being.