We have 2 mares with us who both show similar characteristics and issues that stem back over the past few years and have resulted in chronic weakness and the inability to hold their own weight on 3 legs.  Rest periods only seem to exasperate the issues and in conjunction with our rehabilitative trimming specialist and our vet we are currently working on this strengthening and suppling program.  Initial results are promising - mid way through each lunging session both horses are showing reduced stiffness and a more elevated trot.