Key with tag games is to teach children to master their basic movement skills in relation to simple rules and peers.  As noted by Belka (1998, Strategies for Teaching Tag Games. Journal of Physical Education, Recreation & Dance, 69(8), 40-43.

• Be balanced, in a BASE stance, at all times, ready to move in any direction.
• Use many kinds of fakes when tagging and when avoiding tags.
• Dodge by changing speed and direction quickly and unexpectedly.
• Know what is happening in front, behind, and on either side of you.

Key with Net (tennis, badminton, volleyball) and Wall (squash, racketball) games is the DECISION to MAKE anticipatory movements to where the opponent most likely to send the ball. Based on the angles and depth of a shot played in the opponent's court area, the player needs to move in anticipation of the response.  This can mean moving behind the base-line in games with a bounce or moving forward in the court in games without a bounce in the center of the opponent's target area.

In striking and fielding games a key aspect of the game when fielding the ball is COVER. This means that when ever a ball is pitcher/bowled or struck by the batter the fielders need to be consider where they should go to cover where the ball will be sent to prevent a score.  In particular players need to read what teammates are doing and then cover where the ball might go if a ball is miss fielded or to where the ball will be sent when returned from the field of play.

In territory and invasion games most of the time is spent in off-the-ball movements both in a defensive role or in a support role for team-player who has the ball.  Though all defensive roles such as marking, guarding and covering are import by far the most important off-the-ball movement is in support of a teammate who has the ball.  This can be an offensive support role ahead of a team-mate or a defensive support role behind the team-mate ready to receive the ball and set-up an attack.