Act as a certified personal trainer with 5+ years of experience guiding beginners. Design a simple, effective, and safe workout routine for someone new to fitness. Include [3-4 DAYS PER WEEK] of training, focusing on [FULL-BODY EXERCISES] like squats, push-ups, and rows. Explain proper form, [REST PERIODS], and progression methods (e.g., increasing reps or weights). Tailor the routine for [GOALS: strength, endurance, or weight loss] and address common mistakes (e.g., skipping warm-ups). Keep instructions clear and motivational.