Abstract: A hand exerciser for use in physiotherapy and in muscle building which is suitable for use in exercising of the muscles of the forearm, hand, wrist and fingers comprises a rigid frame (11) spanned by a resiliently deformable web (10) held under tension and formed with an array of cells (12) so as to accommodate human fingers, the web being formed of an elastomer having elasticity and hardness properties which render it capable of deformation when gripped by means of fingers inserted in the cells and appropriately stretched as a result of muscular action.