Conditioning training plays a significant role in modern football, since a football game lasts for 90 minutes (plus the referee's allowance of time lost), requiring from the players a very high level of preparation. During a football match, players must have insight into the space-time relations of the ball movements, of the opponent and be able to solve these situations effectively. Conditioning training is a group of training procedures aimed at developing and maintaining the athlete’s functional and motor abilities as well as the morphological characteristics of athletes in accordance with the requirements of specific sports. There are four basic types of conditioning training: general, basic, specific, and situational. Training planning is a group of procedures determining goals and tasks in a specific period as well as material conditions such as space, equipment, human resources, finances, and others. Training programming includes a precise elaboration of the training plan, determining contents, methods, and methodical-organizational aspects of work. The competition period in football is the most interesting for the athletes and the most challenging for the head coach and the strength and conditioning coach. The purpose of the transition period is the regeneration of the athletes' bodies. The main goals achieved by conditioning training are the following: development of motor and functional abilities, injury prevention, recovery methods, and influence on the morphological body dimensions. From the fitness point of view, testing is performed three times: at the beginning, in the middle, and at the end of the preparation period. They help us to apply certain changes and assess the training plan and program at its end. Injuries are unfortunately a common occurrence for all athletes, including football players. The injury prevention program consists mostly of exercises aimed at joint mobility and stability, muscle flexibility, and core and leg muscle activation as well as proprioception exercises. It is very important to have all three endurance components well developed in order to be able to play 90+ minutes in a high tempo with as few technical and tactical mistakes caused by fatigue as possible. Maximal strength is the basic dimension of strength; training can have a positive influence on the development of muscle endurance and explosive strength. The last chapter shows an example of a 7-day training in the preparation period of the pre-competition phase.