Look at these entries from Ian's workout log: Monday 30-minute run, one more pull-up than last time: 5 pull-ups Tuesday 45-minute bike ride, two more push-ups than last time: 20 push-ups Wednesday Rest Thursday 45-minute run, five more squats than last time: 35 squats Friday 45-minute swim, five more push-ups than last time: 25 push-ups Saturday Yoga class Sunday Rest Based on his entries, which statement best describes his fitness routine? He is applying the principle of reversibility to avoid fatigue. He is applying the principle of overload to increase strength. He is applying the principle of specificity to focus on one area. He is applying the principle of progression to speed up his progress.