Step by Step Guide
Begin lying down on your back with the legs straight and hip distance apart. Hold a kettlebell in each hand at the shoulders with a pronated grip (palms facing away). The kettlebell will wrist on the outer wrist.
Press one arm up to the ceiling as you straighten that elbow. Keep the abs engaged to maintain a neutral spine.
As you lower that arm down, press the other arm straight up.
Continue alternating the chest press here.
Repeat for the desired repetitions.
One common mistake is losing abdominal control which is exhibited by the lower back extended (arching). This is a way of compensating. To avoid this, engage the abs by pulling the belly button to your spine. This will maintain a neutral spine position so the focus can be on strengthening just the chest.