20 lines (13 with data), 610 Bytes

AnyKinStudy BVH_StickFigure = 
{  
  Kinematics.PosAnalysisOnlyOnOff = Off;
  
  AnyFolder &BVHData= Main.ModelSetup.BVHFileData.Model ;
    
  Gravity = Main.ModelSetup.LabSpecificData.Gravity; 
  
  AnyVar FirstFrame = Main.ModelSetup.BVHFileData.Header.FirstFrameNo;
  AnyVar LastFrame  = Main.ModelSetup.BVHFileData.Header.LastFrameNo;
  AnyVar FrameTime = Main.ModelSetup.BVHFileData.Header.FrameTime;

      tStart = FirstFrame*FrameTime;
      tEnd = LastFrame*FrameTime;
      nStep = round(LastFrame-FirstFrame+1);
      
  Kinematics.OPERATION_DISPLAY_PRIORITY(PriorityLow);
  
};