There are several ways to increase intensity. Increase your step height, use longer lever arms or add propulsion moves (where both feet are off the step at the same time). If you are going to add propulsion, or power as it is known today, make sure not to do these moves for more than one minute at a time as these moves result in higher vertical impact. All power moves should be done as you go up onto the platform. Always step down without power. Power moves are considered advanced, and should not be attempted by beginners.
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