Mighty Snail is a core, abs and shoulders workout designed to help you become more powerful in the physical output of your movements. It targets very specific muscle groups to help achieve that sense of overall strength gains. It should be on your list of workouts to master, not least because it barely needs any space to do and, obviously, the only equipment required are your body and this planet's gravity well.
Extra Credit: Do 5 plank walk-outs instead of 4 each time.