To burn fat, sport walking must last from 30 to 50 minutes at a pace that must correspond to 60% -70% of your HRM (Maximum Heart Rate). Use a smartwatch, a smart band or a fitness tracker, with a heart rate monitor. Walk vigorously pushing well with your feet as well as with your legs.
Also use your arms, swing them along your sides at an angle of 90 ° at the elbow. Set yourself a goal and do not abandon it. To help you you can follow the attached table, where the speed is indicative, it depends on your possibilities.
You can distribute physical activity three times a week by choosing the days according to your needs. This training in the park will be very pleasant as well as effective.
For further information: The fast walk