As a personal fitness trainer, design a 15-minute full-body workout routine that includes exercises targeting each major muscle group. Provide clear instructions on how many sets and repetitions to perform for each exercise, as well as any necessary modifications or variations.
Warm-up: Start with 5 minutes of light cardio, such as jogging in place or jumping jacks, to get the blood flowing and warm up your muscles.

1. Squats (Targets: Quads, Glutes, Hamstrings)
- Stand with feet hip-width apart.
- Bend your knees and lower your hips as if sitting back into a chair.
- Keep your chest lifted and back straight.
- Push through your heels to rise back up to the starting position.
- Perform 3