Stand with your feet wide and toes pointed slightly outward.
Shift toward one side, bending that knee while straightening the opposite leg.
Keep your chest raised and working foot flat as you descend.
Push through the bent leg to return, then alternate sides.
Bodyweight Cossack Squat एक्सरसाइज़ गाइड - Glutes वर्कआउट | MuscleWiki