The best replacement for isometric is isotonic.

The best alternatives to isometric are rated as following:
★★★★★  isotonic
★★★  isotonic contraction
★★  isotonic exercise
★★  axonometric
★★  isokinetic
★  isotonic contractions
★  orthographic
★  oblique
★  allometric
★  perspective
★  isotonic exercises
★  dynamic
★  trimetric
★  eccentric
★  isotonic muscle contractions
★  plyometric
  top down
  isotonic muscle contraction
  oblique drawing
  static contraction
  oblique projection
  isokinetic exercises

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Speaking about isometric, one probably shouldn't forget about orthographic.

Other search terms related to isometric and their ratings are:
★★★★★ orthographic
★★★★ orthographic drawing
★★ orthographic drawings
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Google Trends

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isometric
isotonic
isotonic contraction