Mark Falter's 'Financial Fitness Show' covers crucial financial strategies, including growth investing, income investing, estate planning, and tax-free investing. Falter guides listeners through the lifecycle of investing, offering tips on 401(k)s, ETFs, and modern portfolio theory. He emphasizes the importance of proper estate planning and using Indexed Universal Life (IUL) policies to ensure tax-efficient transfers to beneficiaries. Falter also encourages simplicity and actionable steps for achieving financial stability and growth.