Create 10 practical back exercises that specifically improve posture and can prevent or alleviate back complaints, in order to achieve long-term greater well-being and mobility.

Context: [Posture, back exercises, back health, prevention, pain relief, mobility, fitness, health, everyday life, muscle strengthening]

Goal: [Promote a healthy and upright posture, strengthen the back muscles, prevent back problems, practical exercises for home or office]

For each exercise explain:
1) a precise description of the exercise including starting position and movement sequence
2) tips for correct execution and common mistakes
3) advice for integration into everyday life and adjustments for different fitness levels

The exercises should:
- be easy to understand and executable without special equipment
- be suitable for both beginners and advanced practitioners
- contribute to sustainable improvement of body posture
- prevent back pain and promote mobility