Option 2

Back when Georg N'Zola was in his teen years he did some boxing for a few years before pursuing a proper career in hockey, one of the drills involved bouncing tennis balls off of ground with both palms, one at a time though. He would then take a leap towards the direction his boxing coach commanded the size 1/4ths of a circle with 2 steps and proceed his bouncing. Not only was this exercise good for your core, since if you did not have full control of your core you would bounce the ball all over the place and lose control, but to have the ball bounce the most proper heigh using the least possible amount of force to do so was extremely hard as well as keeping a constant eye on the ball if you would lose it. Sometimes you would have had to make a 1/4ths leap yourself because you lost control of the ball. Doing so by yourself did result in you getting a 5x5 at the end of the workout (5 situps, 5 pushups, 5 burpees, 5 squats, 5 pullups in order, 5 times)