Proprioceptive exercises The therapeutic intervention will be divided into static and dynamic proprioceptive exercises, which will be distributed to the groups in a random fashion. The static exercises will be conducted as follows: 1) standing on toes with feet apart; 2) standing on toes with feet together; 3) standing on only right leg without support; 4) standing on only left leg without support; and 5) standing with heel of right (or left) foot touching toes of left (or right) foot with feet in a tandem position. The exercises will be performed on an unstable surface (wobble board) on the anteroposterior (three sets) and laterolateral (three sets) axes. Each exercise will be performed in six sets of 30 seconds each, with a one-minute rest interval between sets. The dynamic proprioceptive exercises will be conducted as follows: 1) walking slowly then more quickly on a trampoline; 2) walking backward with one foot behind the other; 3) walking forward on a beam; 4) going up and down a flight of stairs; and 5) sitting on a Swiss ball (65 cm) and performing laterolateral and anteroposterior movements, circling movements and bouncing. Activities 1 to 4 will be performed in three one-minute sets and activity five will be performed in sets with 30 seconds of each movement. Throughout all exercises a physiotherapist will remain beside the participant to avoid excessive imbalance and the risk of falls.