As of my last knowledge update, Christoph Kramer is still an active football player. He currently plays as a midfielder for Borussia Mönchengladbach in the Bundesliga. While he may have expertise in football due to his professional career, his primary role is as a player rather than a football expert. **

Headphones that are suitable for playing football or football training are typically those that are designed to stay in place during physical activity. Wireless earbuds with ear hooks or ear fins are a good option as they provide a secure fit and won't easily fall out during movement. Additionally, sweat and water-resistant headphones are ideal for outdoor activities like football to ensure durability and longevity. Look for headphones with good sound quality and noise isolation to help you stay focused during your training sessions. **

Football training should not be banned, as it is an important part of physical fitness and skill development for players. However, safety measures should be implemented to minimize the risk of injuries, especially head injuries. Coaches and trainers should prioritize proper technique and safe practices to ensure the well-being of the players. Additionally, regular medical check-ups and monitoring of players' health should be conducted to prevent long-term health issues. **

Football can be a great form of cardiovascular exercise and can help to improve lower body strength, but it should not be considered a replacement for dedicated leg training. Leg training typically involves specific exercises targeting the muscles of the legs, such as squats, lunges, and deadlifts, which are important for building strength and muscle mass. While football can certainly contribute to leg strength and endurance, it is not a comprehensive substitute for a well-rounded leg training program. **

Football shoes are designed specifically for the movements and demands of playing football, such as quick changes in direction, acceleration, and kicking. While they may provide some support and traction for running, they are not ideal for long-distance running or regular running workouts. Running shoes are designed with cushioning and support to absorb impact and provide comfort over longer distances, making them a better choice for running compared to football shoes. **

While it is possible to play football with running shoes, they are not the ideal footwear for the sport. Running shoes lack the necessary traction and support needed for the quick changes in direction, pivoting, and kicking involved in football. It is recommended to wear cleats specifically designed for football to ensure better performance, stability, and injury prevention on the field. **

At 17 years old, many football players are still in their youth or academy teams, working their way up to the professional level. Some may have already made their professional debut, especially in countries with lower age restrictions for professional play. However, it is less common for players to be regular starters or established stars at such a young age. Some notable exceptions include players like Kylian Mbappe, who was already a key player for AS Monaco at 17, and Ansu Fati, who made his debut for FC Barcelona at 16 and became a regular first-team player shortly after. **

During football training, players may experience various types of pain such as muscle soreness, sprains, strains, and bruises. The physical demands of the sport, including running, tackling, and sudden changes in direction, can put a lot of stress on the body, leading to these types of injuries. Additionally, overuse injuries like tendonitis or stress fractures can also occur from repetitive movements during training sessions. It is important for players to listen to their bodies, practice proper warm-up and cool-down routines, and seek medical attention if they experience persistent or severe pain. **