Which is more effective to lose weight, alternating fast walking with slow walking or running?
This will vary from person to person, depending on a person's physique and age. For people with poor physique and older age, it is advisable to walk at variable speed, and gradually combine walking and running after physical growth; Good health and good age can run, from jogging to faster running, that is, variable speed running. This is also an adaptation process, from slow to fast.