IMO, do not expect to do this right after unboxing. Realize that figuring out (and strengthening your muscle to use) the correct form takes a bit of time, and

IMO, do not expect to do this right after unboxing. Realize that figuring out (and strengthening your muscle to use) the correct form takes a bit of time, and if you jump into a 5k row and you aren't feeling it in the right places/it's super easy, you absolutely are not using the right form. Rowing targets muscles most people never use, especially in your back, and it should be quite fatiguing.