I agree with the first half of the scope, but I'm not sure about the second half mainly because it seems like we are limiting the questions to only address a certain part of the sport (rules, regulations, practices, minutia) and not other parts of the sport (training, physical activity, technique).
The F&N FAQ has the following:
Fitness - Stack Exchange is for fitness professionals, athletes and trainers. If you have a question about
improving your exercise performance or technique
choosing a training program
nutrition as it relates to exercise
gear and gadgets used during exercise
achieving physique milestones
injury prevention
This to me sounds more like the physical activity questions suited for F&N are more along the lines of physical fitness, physical training or just general exercise which is different than questions about the physical techniques used in a particular sport. For example, I think that this question would be off-topic at F&N and should be on-topic here:
Difference between one gap and two gap techniques for defensive linemen
I think that both of these can coexist on the same site, but we just need to make a clear distinction between fitness for the sake of fitness and training for a particular sport.
Here is my proposed revision to your original scope:
We exist as a site to ask about the rules, regulations, training and techniques surrounding sports. Questions about physical fitness and general exercise should directed to Fitness & Nutrition.