Break Shot - Adjustments from standard stance

For a beginner I always tell them to hit
it a med-hard speed with a normal stroke,
focusing on accuracy.
On todays equipment with decent balls
a person doesn't really need to hit them
all that hard if they give themselves a
tight rack. Especially considering almost
all amateur pool in the us is 7ft.

For me, in recent years I have been trying
to perfect the Simen Chen style break.
Feet closer together than normal and raise
up smoothly on the forward stroke while
keeping the cue level. I am proficient with
it off the rail on a bar table. A little inconsistent
with this from the kitchen( accuracy suffers)
On a 9ft I don't have the speed I would like
from the rail and kitchen my accuracy is
more inconsistent than the bar table.

It's a work in progress to be sure.

the break is only an advantage of sorts to run out players who can rack their own and are playing on a table with bigger pockets.

to weaker players who will miss during the rack, the only good it does is gives them a chance to make the money ball on the break. so just hitting it hard dead center is the key. and moving the cue ball around till they find the spot that moves the money ball the most.

to medium speed players just your standard stroke but more wrist power to get more speed so you dont sacrifice accuracy. which is more important than speed.

I used to throw my whole body into the break
But now at 73 I calmed it down so my body does not break.
But I can still get a 20 MPH break just using arm strength and timing.