the cool side. No need to come out of the shower all shivering and teeth chattering. Just a little cooler than you would normally like, yet still comfortable. This will help prevent you from washing your natural skin oils down the drain and make you feel energized and invigorated.
Dry air (especially cold winter air): Unfortunately, you can't change the weather and living in dry climates can be tough on your skin. Even tougher if you live were the winters are very cold. If this is where you live, you should moisturize regularly. You may also consider a humidifier for your home to raise the moisture in the air to a comfortable level.
Soap that is harsh or abrasive or scrubbing your skin too hard when you bathe: Why treat your skin like a wood shop project? No need to get the sandpaper out. Again, doing this will strip off your natural skin protecting oils. Use a mild soap and don't scrub…be gentle.