Here's the thing, the melting thing is merely a theory and a bit of an old and superseded one now, as nobody really knows exactly why it *actually* does what it does.
Yes, really.
It's not just speed you need to control, you need to know when to sweep to keep a stone straight or when to make it curl and the ice also changes throughout a game, so you need to adapt. Not all ice surfaces are born equal either!
There is now a thing called 'directional sweeping' where you can try to bias direction, depending on where in front of the stone on the ice you sweep and at what angle, but not all agree that it's worth it. We are now seeing people travelling behind the stone and reaching over the top of it to sweep at various different angles to get an even better view, but that takes practice not to hit or walk into it and 'burn' the stone, especially at speed!
In short, you need to know exactly what to do at the right moment whilst often hurtling down ice sideways (or angled or behind) whilst working with your fellow sweeper whilst listening to your skip whilst listening to the player of the shot whilst watching and often listening to what the stone is doing whilst trying to predict when to sweep/stop sweeping to get the best result whilst it sometimes comes into a crowded 'house' too, so you need to avoid hitting or tripping over any stones and ruining your chances!
Oh and if done right, it's a good aerobic exercise for the arms and shoulders too!
I hope that makes as much sense as it does in my head! ☺️🤣
