It's about 3 o'clock after 8 hours' rest at night shift. About 20 minutes of training is enough. Trying to improve the painful changes in the early stage is the source of relaxation, health and happiness in the later stage. Do more cardio-pulmonary training, such as skipping rope, swimming and cycling. I don't recommend running because it is harmful to the knee joint. I recommend skipping rope and climbing stairs three or four times a week. I believe the landlord will stick to it for a while and the night shift will be relaxed and happy.