Is diet soda ok when fasting for blood test? i am getting a thyroid and cholesterol test, haven't eaten, but, really want a diet soda, does that count?

No, it is not ok. There are artificial sweeteners, sodium, ... In diet soda.

The freezing point of the ice is lowered because of the rock salt which then allows the ice to observe heat from the ice cream mixture without it melting.

You would modify how often you work out in reps and sets and also modify calorie intake