What does BOR mean in weight training?

How do you properly use the back extension machine for an effective workout? How can 23-year-old build muscle fast? Is it true that if you do ab exercises the wrong way your abs will be rounded instead of flat? What is a good percentage of spandex in pants to prevent them from becoming baggy? What is the fixator muscle used in sit ups? How much exercise should a fifty year old do a day? Which shackle should not be used for overhead lifting? What is a 15 incline on a treadmill and how does it impact your workout? Why does your skin go red after a hot shower? What are the pros and cons of using a BCAA supplement for athletic performance and muscle recovery? Does creatine put water in your muscles? What medicine is available for leg cramps? What is the best pull up bar for a thick door frame? How do you pronounce zumba? How can muscle exercise help a speech impediment? Is it ok to transfer a client if they weighed 100lbs or less? What are the different types of deadlifts and how do they differ from each other? What are the benefits of incorporating leg pulling exercises into my workout routine? What is your training goal for the upcoming month? How many times a day do you have have to exercise?