bbo1234:
If the "idea" is somehow conveyed through mass marathon training, there repeatedly seem to be inherent structural problems through such groups and their dynamics.
See [
www.culteducation.com]
Otherwise, ideas can be conveyed through classroom settings at educational institutions such as colleges and universities. And students can sign up and take a course through continuing education and receive credit.
Colleges and universities have accountability, certification, teacher requirements etc. that ultimately protect the students.