Start by standing with your feet shoulder-width apart and holding one kettlebell with the bottom of the kettlebell facing up.
Bring the kettlebell to your shoulders, with your palms facing forward and your elbows bent.
From this starting position, extend your arms upwards so that the kettlebell are overhead.
Make sure to keep your core engaged and your back straight throughout the movement.
Guía de Ejercicio Kettlebell Bottoms Up Single Arm Overhead Press - Entrenamiento de Shoulders | MuscleWiki