Body core training is essential in developing a well trained soccer player. The core consists of the parts in the lumbar region, pelvic region and hip region. There are a number of drills and exercises that will develop and enhance core strength. There are stabilization and strength exercises and power exercises. The FIFA 11 exercises are excellent for a base of the body core training. Extensive core development drills can be found on the internet from a more professional point of view than I can give. I use these for the teams I coach, but cannot profess these to be my own and paraphrasing them would not do justice. Just search for core training and you'll find a number of connections.