under shoe lace 22 fig3 shows a view from above of the spring exerciser 39 s coil extension spring 16 connected to locking clamps 12r 12l which are locked to flexible clamping strap 20 flexible clamping strap 20 is slid under the shoe laces 22 with its ends folded over to form a loop locking clamps 12r 12l are attached to the ends of this overlapping strap fig4 shows a view from above of tennis shoe 18 with locking clamp 12l locked to the back heel portion of the shoe coil extension spring 16 is connected to locking clamp 12l fig5 shows athletic 24 holding flexible clamping straps 20 which have locking clamps 12r 12l locked on locking clamps 12r 12l are connected to each end of coil extension spring 16 the spring exerciser is a device that can be used in many different ways this universal exercising device can also be worn when walking running and jogging referring to fig3 the wearer needs to slip flexible clamping straps 20 under the shoe laces 22 and overlap the flexible clamping strap 20 on top of the shoe lace 22 then take locking clamp 12 and slide it over the overlapped flexible clamping strap 20 by snapping lock plate 13 down the jaws 11 lock into flexible clamping.