Here is a beginner's muscle-building workout plan for a person with 30 minutes of daily workout time and access to basic gym equipment: Day 1: Barbell Squats - 3 sets of 8-12 reps Dumbbell Bicep Curls - 3 sets of 8-12 reps Dumbbell Tricep Extension - 3 sets of 8-12 reps Plank - 3 sets of 30 seconds Day 2: Deadlifts - 3 sets of 8-12 reps Dumbbell Chest Flys - 3 sets of 8-12 reps Dumbbell Lateral Raises - 3 sets of 8-12 reps Bicycle Crunches - 3 sets of 20 reps Day 3: Barbell Bench Press - 3 sets of 8-12 reps Dumbbell Shrugs - 3 sets of 8-12 reps Dumbbell Concentration Curls - 3 sets of 8-12 reps Leg Raises - 3 sets of 20 reps Day 4: Rest Day 5: Repeat the cycle. It's important to remember to warm up before each workout session and to properly cool down and stretch after each session. It's also important to gradually increase weights and resistance to continually challenge the muscles and promote growth. Consult a healthcare professional before starting any new fitness plan.