A force sensor having a compressible layer, an electrically grounded layer and an electrically active layer is disclosed. Novel antimicrobial truncated peptides are disclosed which are based upon SMAP 29 and RCAP 18, but which contain a lesser number of amino acid residues yet still retain bactericidal activity. The value of the content is determined by weighting factors, such as access frequency, a rating, a size of the content, a type of the content, and a security level of the content. The apparatus may include a base forming the training area and a pair of tower assemblies, each providing elastic cords for attachment to the harnesses worn by the athlete.