CellFit is a European network of excellence (COST Action CA16119), with competence on all levels within fundamental biology, bio-engineering as well as clinical research. CellFit aims to translate the present basic knowledge in cell control, cell repair and regeneration from the laboratory bench to the clinical application. Furthermore, CellFit will create synergies, optimize the use of human and financial resources and foster the value of ex vivo models for European R&D operations.