Skill Dice. Choose from 6″ or 8″. Can’t decide what to train? Leave it up to the luck of the roll with Skill Dice! Roll each die to find out which martial arts move and exercise you’ll be doing, and for how long. Skill Dice are great for youth classes and training games. Gold dice: Sit-ups, Burpees, Tuck Jumps, Push-ups, Jumping Jacks, Mountain Climbers. Blue dice: Kick, Strike, Block, Punch, Jump Kick, Stance.