As a personal fitness trainer, design a 15-minute full-body workout routine that includes exercises for each major muscle group. Provide step-by-step instructions and recommended repetitions for each exercise.
Here is a 15-minute full-body workout routine that targets each major muscle group:

1. Warm-up:
Start with 2-3 minutes of light cardio exercises such as jogging in place or jumping jacks to get your heart rate up and warm up your muscles.

2. Squats: Targets your legs and glutes.
- Stand with your feet shoulder-width apart.
- Bend your knees and lower your hips as if you are sitting back into a chair.
- Keep your chest lifted and your