I would have to agree with Mightyb's opinion.
But given its the internet and really the only thing we can talk about is the concepts or experiences.
And plus I'm a Univ. Student so I spend most of my time obsessing about concepts and logic flow... (lol, not much of a life)
So for me the forms in themselves represent the concepts for instance not only are there underlying concepts but their are surface layer concepts as well.
1st. the name themselves represent a concept.
Sap yi lo tan toy (12 roads spring leg) Builds a strong core with reactive kicks (not stringent)
Gune lik kuen (Flow Power Fist) or sometimes "Power boxing" etc...
Sap sei lo tan toy (14 roads spring leg) Showcases the concepts of the mechanics of mantis boxing
Beng bu (Crush step)(Burst step)
Chap choy (Thrusting Hammer) Teaches how to issue power from a vertical position.
Dou gang (avoid force-parry) as the name implies teaches the student how to avoid force from a parrying position. Instead of the "force against force" complex
Sap ba sau (18 elders) teaches the student how to issue "Jing" from a soft approach utilizing the Chat Sing Bou.
Ha Fu Ga Chao (black tiger cross) As Mightyb gave descriptive details.
What was stated above represents the surface layer concepts and "body methods" (Sun Faat)
Then we have the concepts that each mantis system will utilize in training (for instance some families will pay more attention to certain sequences or body mechanics) some may use the fa jing concept while other pay more attention to the seung kua concept, etc... then the "12 keyword principles" are of vital importance as well.
Instead of re listing what many have already posted, I'll just post a link to a discussion thread.
http://www.mantisquarterly.com/forum...php?t-218.html