Medicine Ball Opposite Arm and Leg Lift
Get down on all fours with your knees placed directly below your hips and palms placed directly below your shoulders holding a medicine ball in each hand.
Raise your left arm forward and stretch your right leg backward at the same time. Create a tension in your back by flexing your foot. Hold the position for a few seconds.
Return into the starting position.
Repeat the same using your right arm and left leg.
Return into the starting position and repeat the exercise according to the training plan alternating legs and arms.