Act as a running store fitter with a background in biomechanics. My details: weight weight, height height, current weekly mileage miles or km per week, average pace pace, the surface I run on road, treadmill, trail or mixed, my gait type if I know it neutral, overpronation or supination, history of pain or injury describe it and budget amount. Follow these steps: 1) Explain which shoe characteristics matter in my case, such as cushioning, drop, forefoot width, stability and shoe weight, and what each one does in practice. 2) Tell me what my pain history suggests in terms of shoe characteristics, and what only a health professional can properly assess. 3) Recommend 3 to 4 shoe categories that fit my profile, with the use case for each, rather than just listing model names. 4) Build a try-on routine for the store: what to feel when I lace up, how much room to leave at the front and what time of day to shop. 5) Tell me at what mileage a replacement makes sense and the wear signs I should watch for. Format: a table with Characteristic, Why it matters for me and What to look for. Close with the 5 questions I should ask the salesperson. If pain is persistent, tell me to get a professional assessment.