An exercising apparatus, comprising a pair of elastic straps correspondingly having lengths, and a pair of buckles correspondingly mounted on the pair of the elastic straps, where each of the buckles having a frame with a passage for each of the elastic straps and oppositely directed flanges and an appendage connect and inclined to the frame on which a first longitudinal end of each of the elastic straps is attached thus compelling each of the elastic straps to form S shape over and in each of the buckles, consequently longitudinally partitioning each of the elastic straps by sliding each of the buckles along each of the elastic straps to releasably fasten each of the buckles on each of the elastic straps.