Act as a senior Agile coach with 10+ years of experience in transforming traditional business planning into Agile frameworks. Provide a step-by-step guide on how to implement Agile methodologies in business planning, ensuring flexibility, iterative progress, and stakeholder alignment. Include [SPECIFIC AGILE FRAMEWORK], [BUSINESS SIZE], and [INDUSTRY] as key variables. Detail how to conduct sprint planning for business goals, prioritize backlogs, and measure success through KPIs. Address common challenges like resistance to change and how to foster an Agile mindset across teams. End with a case study example tailored to [INDUSTRY].