Now something scream.
Take the 5kg weight, like first balls on the surface, book above, and this time it puts the 5kg weight on top of the book.
Do you feel like crushing them well? You should always crush it like this.
Start counting 1 missisipi 2 missisipi ... arrived to 30 missisipi take away the weight, and massages the balls for maximum 10 seconds, after which put it back on, and counts another 30 missisipi.
do it 5 times.