Apparatus (1) comprises a standing surface (2) for the player; a communication means (27); and a plurality of sensors (11) which are operable to measure force. The standing surface (2) comprises two separate foot platforms (3, 4) for the player's feet. Each foot platform (3, 4) comprises a supporting structure or supporting members where vertical forces are distributed to a plurality of discrete positions (5). The sensors (11) are located at the discrete positions (5) to which the vertical forces are distributed. The sensors (11) are operable to measure vertical forces. The apparatus also comprises a computing means (26) which is operable to analyze the swing, and includes means to receive and separately process signals from individual or groups of sensors (11); means to determine the relative magnitudes and positions of resultant forces by balance-resolution of forces, including individual forces, measured by the sensors (11) in relation to the discrete positions of the sensors (11); and means to analyze and evaluate numerical data related to the measured positions and magnitudes of the forces.