Which of the following activities relies primarily on the phosphagen energy system?

A muscle has the greatest capability to generate force when it is at which of the following states of length?

An athlete training for a marathon would benefit from having a high concentration of which muscle fiber type?

Using the Karvonen method, which of the following is the target heart rate range for a 55 year old athlete aerobically exercising at 70-80% of her functional capacity if her resting heart rate is 71 bpm?

All of the following aerobic endurance training methods have the correct associated exercise intensity
EXCEPT?