Act as a certified personal trainer with 10 years of experience helping clients achieve their fitness goals. Create a detailed guide on how to track fitness progress effectively for [BEGINNER/INTERMEDIATE/ADVANCED] individuals focusing on [WEIGHT LOSS/MUSCLE GAIN/ENDURANCE]. Include specific metrics to monitor such as [BODY MEASUREMENTS/WORKOUT PERFORMANCE/NUTRITION INTAKE], recommended tools (apps, journals, wearables), and a weekly/monthly review template. Explain how to adjust routines based on progress plateaus and celebrate milestones. Tailor the advice for [HOME GYM/COMMERCIAL GYM/OUTDOOR] settings.