Sit tall with legs extended, arms holding straps at shoulder height.
Start with arms forward, palms facing forward, shoulders relaxed.
Pull arms out to a T, squeezing upper back without leaning.
Return slowly to start, maintaining upright posture and controlled tension.
バックローのプレップ(座位エアプレーン) एक्सरसाइज़ गाइड - リアデルト वर्कआउट | MuscleWiki