Personalized Workout Plan for Muscle Building and Cardiovascular Endurance: Day 1: Upper Body Strength & Cardio 1. Warm-up: 5 minutes light jogging on the treadmill 2. Dumbbell Bench Press: 3 sets x 10 reps 3. Dumbbell Rows: 3 sets x 10 reps 4. Bicep Curls: 3 sets x 12 reps 5. Tricep Dips: 3 sets x 12 reps 6. Cardio: 15 minutes on the treadmill (alternating 1 minute jog, 1 minute walk) Day 2: Active Recovery & Stretching 1. 10 minutes light jogging on the treadmill 2. Full-body stretching routine (20-25 minutes) Day 3: Lower Body Strength & Cardio 1. Warm-up: 5 minutes light jogging on the treadmill 2. Goblet Squats: 3 sets x 10 reps 3. Romanian Deadlifts: 3 sets x 10 reps 4. Resistance Band Glute Bridges: 3 sets x 12 reps 5. Resistance Band Lateral Walks: 3 sets x 12 reps each side 6. Cardio: 15 minutes on the treadmill (alternating 1 minute jog, 1 minute walk) Day 4: Yoga & Core 1. 20 minutes of yoga (following a beginner or intermediate routine) 2. Plank: 3 sets x 45 seconds 3. Bicycle Crunches: 3 sets x 15 reps each side 4. Russian Twists: 3 sets x 15 reps each side 5. Leg Raises: 3 sets x 12 reps This 4-day workout plan combines strength training and cardio exercises for muscle building and improved cardiovascular endurance. Remember to always consult a healthcare professional before starting a new fitness program, and adjust the workout plan as needed based on your preferences and progress.