You can increase the challenge of your workouts by using Newton's first law of motion. We are given the example of running on sand or biking on gravel. What are some other ways that you can use Newton's first law to create a more challenging workout? When you change the terrain, what is that force called?

Exercise on surfaces that cause your forward motion to slow down so that you have to use more energy to keep moving forward. For example, run on sand instead of pavement or perform aerobic exercise on rubber mats instead of wood flooring. Bicycle through gravel instead of on the sidewalk. This is called biomechanics.

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