Inertia

"Every body remains in a state of rest or uniform motion (constant velocity) unless it is acted upon by an external unbalanced force. This means that in the absence of a non-zero net force, the center of mass of a body either remains at rest, or moves at a constant speed in a straight line." Isaac Newton, First Law of Newton's laws of motion.

You can can apply this issue on parkour, too. I believe that my training and one of anybody else proceeds in fact inertially. In other words we tend to train

• on the same spots (e. g. playgrounds or trees)
• the same things (e. g. strength training or favourite technique like dash vault) and
• in the same way (e. g. in a team or alone)

You can call it 'habit'. Nevertheless, in order to become an experienced traceur in all areas of parkour, you must break your habits, open your mind to other possiblities of training and try to involve them in your sessions!

Remind the Newton's words:  "...unless it is acted upon by an external unbalanced force", so it is not easy!

Thanks for reading

Michail