I agree, I would also check the show’s website for more information.
But it is typically body weight lost by percentage. Not body fat lost, not by body composition, but by overall weight lost relative to the previous body weight.
If you are thinking of using this format for a program, I would encourage you to consider using either means such as those listed above.
I joined a local BL comp @ my gym. You basically get two group training sessions, nutritional advice, work out plan and the support of training in a team environment.
It is what it is. Great for encouraging those who have weight issues to do exercise and also imparts knowledge on how to use the equipment, do specific exercises and manage oneself.
The negative aspects is that it is weight focused. While that maybe the overall goal we all know there are many issues underlying obesity and much of them are emotional. This aspect is not and can not be addressed in a group setting.
There were also a lot of injuries with members trying hard to beat each other and not having acquired the right knowledge on how to train safe e.g. push limits.
As a fitness professional coming back from my own serious injury these two factors bothered me. We are trying to improve our clients health and well being not cause harm.
I was also disturbed by the number of participants that were on their second or third BL. And the percentage of people with injuries.
BL on TV provides provides professional mental, physical, emotional and medical advice.This is not achievable for your average gym. I would suggest you think long and hard on how you would manage these before embarking on this journey with your clients.