Beginner's At-Home Workout Plan

Act as a certified personal trainer. Create a 4-week, beginner-friendly workout plan that can be done at home with no equipment. The plan should consist of 3 workout days per week, focusing on full-body exercises. For each workout day, provide a list of 5-6 exercises (e.g., squats, push-ups on knees, planks), specifying the number of sets and reps. Include a brief description and a safety tip for each exercise.