The need for different phases of training to prevent which of the following?

do you have any options but i can gueas it will train your body to beat the diseases and sickness that will enter your body

The correct answer is overtraining.

Explanation:

Overtraining is a common issue in weight training, however, it can also be faced by runners and other athletes. It takes place when the intensity and volume of the exercise enhance from the recovery capacity of an individual. Due to overtraining, the person stops making progress, and even start to lose fitness and strength.  

Some of the detrimental effects of overtraining are decreased performance, excessive fatigue, increased perceived effort at the time of workouts, loss of appetite, agitation and moodiness, metabolic imbalances and others. In order to overcome the issue, the person needs to train in different phases. As different phases of training help an individual from getting over-trained.