Stand tall with your core braced and flat back and a kettlebell (or dumbbell) held directly overhead in your left hand. This is your start position. Step backward with your left leg and bend at the knee, slowly lowering your body until your front knee is bent at least 90 degrees, whilst your rear knee should be hovering just off the floor. Inhale as you do so. Keep your torso upright the entire time, your core brace and keep the arm holding the kettlebell overhead locked out throughout. Pause at the bottom of the movement, then extend your knee as you push off from your left foot to move forward and return to the start position. Repeat all the required reps (or time) on one side before changing to the other.