Time is like the answer above. You can start to burn fat in 30 minutes, but you should also pay attention to the intensity of exercise. Without proper exercise intensity, it is useless for a long time. The best intensity is 60% to 70% of your highest heart rate. The average person is 120 to 130 times per second.

Besides, as for the calf, he won't run as thick as you think. Running plus some jumping exercises will give your soleus muscle and Achilles tendon full exercise, make your calf soleus muscle on the topic, and make your calf look slender. You can look at the calves of some runners and jumpers.