Recommendations: 2-3 Sets, 8-12 Reps
Sit on a chair, with your feet flat on the floor and close together. Hold water bottles at your sides with a pronated grip (palms facing backwards). This is the starting position. Curl the bottles up to your shoulders while rotating your hands into an underhand (palms facing up) grip. Your upper arms should stationary throughout the entire motion. Exhale during this movement. Slowly lower the bottles to the starting position. Inhale during this movement. Repeat for the required number of repetitions.