Lie prone on the box, chest supported, arms holding straps forward.
Start with arms straight, palms facing down, shoulders relaxed.
Pull arms back in a sweeping motion, engaging upper back.
Return to start with control, keeping neck long and torso stable.
बॉक्स पर लेटकर बैकस्ट्रोक की तैयारी एक्सरसाइज़ गाइड - लैट्स वर्कआउट | MuscleWiki