Stand with your feet shoulder-width apart and hold the sledge hammer with both hands.
Engage your core and keep your back straight.
Swing the sledge hammer down towards the ground, using your core and upper body strength.
As you swing down, pivot your hips and transfer the force to the hammer.
Repeat for the desired number of repetitions.
Activation
Abs
PrimarySets
3–5
Reps
8–12
Rest
60s