The Collaborative International Dictionary of English v.0.48:

Gymnic \Gym"nic\ (j[i^]m"n[i^]k), Gymnical \Gym"nic*al\
   (j[i^]m"n[i^]*kal)a. [L. gymnicus, Gr. gymniko`s: cf. F.
   gymnique. See Gymmasium.]
   Athletic; gymnastic. [Obs.]
   [1913 Webster]

         Have they not swordplayers, and every sort
         Of gymnic artists, wrestlers, riders, runners?
                                                  --Milton.
   [1913 Webster]