Ladakh/ Siachen, June 21 (ANI): Undeterred by harsh weather conditions, personnel of the Indo-Tibetan Border in Ladakh and army personnel in Siachen marked the 3rd international Yoga Day by performing various postures, breathing exercises and meditation. The nation is celebrating third International Yoga Day. This year the theme of the day is 'Yoga for Harmony and Peace'. The yoga protocol will begin at 7 a.m. and last for 45 minutes. In high altitude areas, Yoga not only help soldiers in relaxing and de-stressing but also helps in combating various diseases such as high altitude sickness, hypoxia, the psychological stresses of isolation and fatigue.