Ball slam
 

Medicine ball slam

Stand with your knees slightly bent holding a medicine ball above your head with your arms extended. Bend forward at the waist and use your core muscles to slam the ball against the floor about a foot in front of you. Let your arms follow through so you don't fall forward. Catch the ball on its way back up and repeat.

Top tip: Make sure you’re using this move as an abs exercise, not a shoulder builder. Focus on crunching your abs as you bring the ball towards the floor, you’ll be amazed at how much more power you generate. It’ll bounce so high you’ll have to look out for low ceilings.