In this audio, Charlotte addresses the use of treadmills which are commonplace in most gyms in the country but many people are unaware of their dangers. Constantly using a treadmill can cause repetitive stress injuries and strain due the body not being able to stay naturally aligned. The disadvantages of treadmills far outweigh the benefits for weight loss. Rather walk on a natural surface, try a trampoline or join a Pilates class that includes cardio fitness.

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For more information:

https://www.quora.com/What-are-the-disadvantages-of-using-a-treadmill-to-lose-weight
https://www.drweil.com/health-wellness/balanced-living/exercise-fitness/how-dangerous-are-treadmills/
https://www.livestrong.com/article/544962-treadmills-hip-pain/