Mad Dogg Athletics trademarked the word “Spin” (coupled with “Spinning” and “Spinner”) from the early nineties; the company is protecting of its usage. We utilize the generic phrase “indoor biking” commonly all over this guide, Although many people who are into this type of exercise routine use “Spin” or “Spinning” https://advertisesmart.com/view/post/Important-Gear-for-Russian-Twist-Exercises/142