
1) Big hikers 2) Certain ball passers 3) Concentrates 4) Convergence points 5) Court figures 6) Focal points 7) Gets oneself focused 8) Gretzky and ewing 9) Hiking experts 10) Hubs 11) Middle linesmen 12) Middle points 13) Middles 14) Midpoints 15) Midsections 16) Some linemen 17) Speciality stores
Found on
https://www.crosswordclues.com/clue/centers

1) Cores 2) Hearts 3) Hubs 4) Loci 5) Midsts 6) Nexuses 7) Nuclei
Found on
https://www.crosswordclues.com/clue/centers
[Fourth Way] In G.I. Gurdjieff`s Fourth Way teaching, also known as The Work, centers or brains refer to separate apparatuses within a being that dictate its specific functions. According to this teaching, there are three main centers: intellectual, emotional, and moving. These centers in the human body are analogous to a three-storey facto...
Found on
http://en.wikipedia.org/wiki/Centers_(Fourth_Way)

Playing positions in the middle of the backline (inside center and outside center).
Found on
http://www.encyclo.co.uk/local/21230

Two positions in the middle of the Backs line, called Inside Center and Outside Center.
Found on
https://www.encyclo.co.uk/local/22060
No exact match found.