While aerobic fitness receives more of the attention, conditioning for soccer should entail more than running, running and more running. In addition to aerobic and anaerobic training, soccer players should focus on working the smaller twitch muscles mentioned in the article. This will help with the explosiveness needed in the sport.
However, flexibility is also very important to a soccer player. Dribbling, shooting and kicking skills all require a degree of flexibility. A more flexible player is better prepared to hone these skills. Yoga and other stretching routines are great for soccer conditioning.