If you do not have muscular upper limbs now, joining and separating the parts will develop them to Arnie proportions. They fit very tightly, the enclosed tool is too small to allow enough leverage.

The box could really do with having the contents increased by one half at least as there is a shortage of atoms once a moderate sized item has been assembled.

I was loathed to take apart the molecule once I'd assembeld it due to the physical exhaustion that I suffered assembling it.