The puzzle can have the third side ,this is in keeping with the law of three ,three modes of development encased in a puzzle piece .
In Thomas Cleary's book - Understanding Reality
translation of an 11th Century Classic by Chang Po-tuan states that to refine the 'law of three' or 'three treasurers' one practices a type of moving meditation that is a progressive refinement ... a detachment of shifting awareness of the body to the awareness of breath; from awareness of breath to awareness of mind; from awareness of mind to awareness of space; from awareness of space to awareness of the Tao.
This, I believe is what you are referring to in your puzzle as:
3.I am involved in sweat sessions that are physical and mental yet have a spiritual side . The puzzle side of matters will cross through these ,but the spiritual eye must open, to open the third side of the puzzle .
This is an internal progression/refinement which many fail to understand, which leads back to "why do I train?" Good thoughts, Max.