Mike has begun a new workout program. He will squat on Tuesdays and Thursdays. During weeks 1-2 Mike squats 3 sets of 10 at 150lbs. During weeks 3-4 Mike squats 3 sets of 10 at 160 lbs. During weeks 5-6 Mike squats 3 sets of 10 at 165 pounds. He is practicing the principle of [ Select ] . If Mike was trying to improve his bench press and the only lift he was doing was squats, he would not be following the principle of [ Select ] . Mike also begins a running program. He decides to run Monday, Wednesday, Friday, for 30 minutes. Mike is missing the [ Select ] part of the FITT principle with his running prescription. Mike is 35 years old, we could therefore estimate is maximal heart rate to be [ Select ]