Problem
1) During a push-up, what type of lever does the triceps brachii create at the elbow joint? Which of the functions of levers does this muscle utilize?
2) How does the angle of pull of elbow flexors change throughout the pull-up movement? Using vector analysis of biceps force, compare the rotary and stabilizing components at the start, in the middle, and at the finish of the pull-up.
3) Explain the relationship between mechanical advantage of the knee extensors and the amount of tension developed in this muscle group compared to the amount of resistive force in the leg extension exercise.