Over the coming years, more information will surface about how the body can grow muscle mass using very short but intense muscle activation. In the meantime, here's some articles to get you started.
For the Cat routine, its important give it all you have in 5 seconds (at least 3 seconds). This should bring your muscle load over 70% of its maximum force, unfolding proteins that initiate the process of muscle growth. Your muscles will grow while they rest; you are doing the cat routine all day after a one minute intense activation session.
Find your lazy happy cat, with this easy bio hack that the cats have been teaching us for thousands of years.