As in case of muscles which receive their nutrients directly via the vascular system through rapid exchange rhythm, there is no such active supply system for cartilage tissues covering the ends of bones in joints. Cartilage instead is fed by the migration of particles from the joint fluid surrounding it, known as the synovial fluid. To be able to absorb the synovial fluid optimally, the cartilage has recourse to an alteration of pressure and suction.
It is precisely this regular rhythmic exchange optimizing the supply to the cartilage that is achieved with the flexibility exercises. Indulging in regular stretching exercises leads to enhanced cartilage nutrition and loosening up of all the connective tissues. While performing stretching exercises both outward and inward concentration is necessary.