Step by step instructions, muscle activation and variants for the Weighted Bottle Side-Lying Shoulder External Rotation.
The weighted bottle side-lying shoulder external rotation is a rotator cuff strengthening exercise performed lying on one side with a water bottle or similarly light improvised weight. By rotating the forearm upward from a bent-elbow position, it isolates the infraspinatus and teres minor — key muscles for shoulder health and stability.
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The Weighted Bottle Side-Lying Shoulder External Rotation is a foundational movement that builds strength and muscle through controlled, progressive overload. Train it 1 to 2 times per week with 3 to 5 working sets per session, gradually adding weight or reps as form holds up.