What are the most significant benefits that bike handling classes and clinics can provide to riders of different skill levels, and how do these benefits translate into real-world improvements in safety, efficiency, and overall cycling enjoyment, particularly for those who are transitioning from casual commuting to more frequent or longer-distance rides? Are there specific skills or techniques that these classes and clinics focus on, such as cornering, braking, or bike positioning, and how do instructors tailor their teaching to accommodate riders with varying levels of experience and confidence? Do these classes and clinics also cover topics like bike maintenance, component selection, and fit optimization, or are they limited to on-bike instruction and drills? Can riders expect to see measurable improvements in their cycling performance and confidence after completing a bike handling class or clinic, and are there any specific metrics or benchmarks that instructors use to assess student progress and provide feedback?