in russian, 9x4 means 4x9 so dont let that mess with u
it starts with a 1 week introductory micro cycle that is pretty easy; 3 times a week
then it introduces 4 different set/rep styles to do on each day:
mon, wed, fri, sat
4x9, 5x7, 7x5, 10x3
70%, 75%, 80%, 85% of 1rm
then the second week, you add 10kg to each lift. and the suprising thing is, you actually get it.
week 3, you add 5kg more and it works as well.
week 4 is rest/max out week.
i was skeptical at first b/c i didnt know if i was going to be able to progress that fast, but it actually worked.