Originally Posted by richDDT
I have read something about you need to flex your boots with your ankle, not with your knee, I wonder what does that mean? I can't really flex my boots without my knees,(can't even flex my shoes with my ankle alone,)
Not a dumb question. No joint flexes anything. You create movement across a joint using muscles that originate above it and end below it. So you can flex the ankle both directions actively, by contracting (among others) the tibialis anterior or gastrocnemius. Or you can flex it passively, by using other muscles higher up to move your Center of Mass forward and down so that your shin leans into the front of your boot. Try just watching your foot wiggle as you flex your ankle to lift your toes, and then to drop your toes. See what happens when you pronate (invert the inside arch downward) or supinate (evert the outside of the arch downward). All of this is happening across the ankle, all is active.
Both kinds of "flex" are necessary, although if one kind really predominates, it can create a different style of skiing. I think the "something" you read probably advocated active feet, using ankle and small foot movements inside your boot to create lateral pressure moving from your boot tou your ski edges. Doing ankle rolls, for instance, with the upper leg and body quiet, is a classic way to learn this. From there, instructors may progress to using the ball of one foot, or the little toe of the other, to initiate turns. Another ankle movement, retraction, is taught by dorsiflexing (trying to lift the toes) when the ski's flat, to get the feel right. Nowadays, instructors discourage just leaning into the front of the boots.
By contrast, though, many skiers have very passive feet, ski more by cranking their knees and hips. (Or just banking, not much lower activity at all.) And many skiers still do a lot of riding the tongues. My own opinion is that a good turn necessarily starts from the feet and ankles, and can end there too, but you'll need to add knee and even hip movement if you're getting more aggressive, or handling higher speeds on steeper pitches.
You may have a heard time feeling your boots flex, but if you are sure they're not, then they're too stiff for how you ski right now. OTOH, if you can't feel your street boots flexing, then maybe it's some issue you're having with figuring out how it feels, cuz it's happening. Try this: Take your ski boot and remove the liner. Buckle up the shell. Now stick your hand down into the shell until you touch the inside bottom at the heel. Push your hand forward and watch the boot flex. Watch what happens to the entire boot, not just the tongue. Various parts of the shell will change. Now put in your foot, still no liner. Repeat.