In India, we believe sitting with your leg hanging is not healthy. We usually sit on the floor which will restrict blood flow to the lower part of the body, resulting in more blood to the upper body where most of the vital organs are.
Yogis/Rishis sit for months in that cross legged posture without any issues.
Standing/Jogging/Walking is not the opposite of sitting. We need to learn how to sit properly
Are you referring to the Yogis who maintain specific positions for years, deforming their bodies into gnarled, unusable limbs? I wouldn't consider that healthy at all. I would consider them mentally ill.
Yogis/Rishis sit for months in that cross legged posture without any issues.
Standing/Jogging/Walking is not the opposite of sitting. We need to learn how to sit properly