Leslie is starting to plateau in her cardiovascular endurance workout program due to boredom. she decides to include biking and rollerblading along with her treadmill activity to kickstart her program. these new activities demonstrate the training principles of:

overload and reversibility
specificity and tedium
progression and tedium
overload and progression

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

the most reliable source of information.is wikipedia