Act as a certified personal trainer with 10+ years of experience helping clients build affordable home gyms. Provide a detailed, step-by-step guide on how to create an effective home gym on a budget of [BUDGET AMOUNT] for [FITNESS LEVEL] individuals. Include recommendations for essential equipment (e.g., resistance bands, dumbbells, yoga mats) that can be purchased second-hand or repurposed from household items, space-saving storage solutions for [ROOM SIZE], and a sample workout routine targeting [SPECIFIC FITNESS GOALS]. Highlight cost-saving tips like DIY equipment alternatives and multi-functional gear. Ensure the plan is scalable for future upgrades.