What is Calisthenics?

When to use Calisthenics?
What is Calisthenics?
How to do calisthenics?
​How to start adding calisthenics to your workout plan?

​Research Notes:
https://www.statista.com/statistics/191527/participants-in-calisthenics-in-the-us-since-2006/
https://www.sfia.org/reports/834_Calisthenics-Participation-Report-2020
https://www.medicalnewstoday.com/articles/calisthenics
https://www.merriam-webster.com/dictionary/calisthenics
https://www.bodybuilding.com/content/the-ultimate-beginners-guide-to-calisthenics.html#:~:text=%20The%20Ultimate%20Beginner's%20Guide%20To%20Calisthenics%20,at%20the%20same%20point:%20the%20beginning.%20More