The science and arguements for the fitness program
Scientific study showed that simultaneous sprint and endurance training decreased sprint speed and jump power.
Callister et al. showed that simultaneous sprint and aerobic endurance training decreased sprint speed and jump power. (Callister et al. Performance adaptations to sprint, endurance and both models of training. J.Appl. Sport Sci. Res. 2:46-51. 1988.) To read the entire study click here.
Power lies at the heart of athletic success and movement.
Why would you want to get into shape only to jeopardize that oh so vital quality, your speed? The goal is to become the best player or the best team. Scouts and coaches notice speed and power on the soccer field. To win more games and be noticed more by scouts and recruiters it helps to be fast and quick. Your training program must decrease the likelihood that you will lose that speed and power. Please remember, this is a fitness program meant to decrease loses in speed by faulty training methods, not a speed program. I just want to make sure that you consider the overall athlete while developing soccer fitness. If you mess up in this one area it can affect your soccer speed and power. If you still don't believe me then read this excerpt I got from the credible PubMED.
"The development of power lies at the foundation of all movement, especially athletic performance. Unfortunately, training programs of athletes often seek to improve cardiovascular endurance through activities such as distance training that are detrimental for the performance of power athletes, rather than using other means of exercise. Performance decrements from continuous aerobic training can be a result of inappropriate neuromuscular adaptations, a catabolic hormonal profile, an increased risk for overtraining and an ineffective motor learning environment. However, long, sustained exercise continues to be employed at all levels of competition to obtain benefits that could be achieved more effectively through other forms of conditioning. ......."
http://www.ncbi.nlm.nih.gov/pubmed/17190535?dopt=Abstract