Please help me! Put this paragraph in your own words :)
Mark is not experiencing any gains in his strength and endurance because he's not applying the principles of fitness to his exercise routine. First, he needs to ensure he is overloading his muscles every session since his body has adapted to his current routine. Next, Mark needs to make sure his routine is progressing in duration, intensity, frequency, and type. Lastly, he needs to make sure he sets specific goals so he has a road map to follow.