Begin by standing with your feet hip-width apart and holding a kettlebell at one side of your body, with your palms facing your thighs.
Hing forward with a flat back and lift the kettlebell.
Hold the kettlebell at your side and make sure to not lean to one side.
Przewodnik Ćwiczenia Crosslateral Core Stabilisation Unilateral Load Kettlebell - Trening Forearms | MuscleWiki