Does home-based training work in kidney transplant recipients with reduced physical function? The goal of this clinical trial is to learn if home-based training works to better physical function in adult kidney transplant recipients. It will also learn about participants preoperative physical function. The main question it aim to answer is * Does home-based training improves physical function in kidney transplant recipients. * All the participants are assessed to have reduced physical function before the transplantation Participants will: * follow either a home-based training program or todays standard of physical activity after kidney transplantation * the program starts 4 weeks after the transplantation and lasts for 12 weeks. A physiotherapist will help the participants in the beginning. * the program consists of both cardio-training, strength-straining and optional activity * the training group will be followed up every week by phone. Their activity will be documented via patients logs and heart rate monitor. * the effect of the training will be evaluated one year after the transplantation