Russian Twist

• Hold a dumbbell, barbell weight or something else that is heavy with both hands, but make sure it is not too heavy and you are able to keep in form.

• Lean back to a 45-degree angle from the floor. For an extra challenge, lift your feet off the floor.

• Rotate your arms to one side to the same level as your chest, touch the floor for a little extra challenge, and then do the same to the other side. When you're back in your original position after doing both sides it will count as 1 rep.