That's not true. On the contrary. Stretching (yoga) should be preceded by aerobic (running). Running is aerobic exercise, and there are many stretching exercises in yoga, which can make your muscles slender and beautiful.

Remember that the correct exercise steps are anaerobic (equipment and the like), aerobic (running, skipping, dancing and the like) and stretching. The final stretch must not be less! ! Very important! In this way, the body shape after exercise can look good.

Physical education is a science with a lot of knowledge. You can learn more at ordinary times, and the more you practice, the better you look. I wish I could help you: D