Question is simple.
Will I be more motivated with one good friend or with a group of the same interested people during group exercise?
Does group size affect our internal motivation? (starting by size of 2 people up to X)
Where are bounds for the worst motivation, average motivation and the best motivation for physical workout? (or we can discuss other activities as well)
My input: I'm just thinking about competition feelings in bigger group of people when my brain is saying something like this: "I have to be better than everyone else."
This question doesn't need to be exclusively bound to the gym workout.