The Collaborative International Dictionary of English v.0.48:

Gymnastic \Gym*nas"tic\, n.
   A gymnast. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gymnastic \Gym*nas"tic\ (j[i^]m*n[a^]s"t[i^]k), Gymnastical
\Gym*nas"tic*al\ (j[i^]m*n[a^]s"t[i^]*kal), a. [L. gymnasticus,
   Gr. gymnastiko`s: cf. F. gymnastique. See Gymnasium.]
   1. Pertaining to athletic exercises intended for health,
      defense, or diversion; -- originally said of games or
      exercises, as running, leaping, wrestling, throwing the
      discus, the javelin, etc.; in modern times more
      specifically applied to athletic exercises demonstrating
      balance and agility, such as tumbling, somersaulting, and
      bodily maneuvers performed on special equipment such as
      parallel bars or a balance beam; as, gymnastic exercises,
      contests, etc.
      [1913 Webster]

   2. pertaining to disciplinary exercises for the intellect.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gymnastic
    adj 1: vigorously active; "an acrobatic dance"; "an athletic
           child"; "athletic playing"; "gymnastic exercises" [syn:
           acrobatic, athletic, gymnastic]
    2: of or relating to or used in exercises intended to develop
       strength and agility; "gymnastic horse"