The friction generated by your hands creates heat.
There are a lot of nerve endings in your feet and hands so they are very likely to get cold. When, you warm them then your whole body will be warmer because they were the coldest part of your body.
Sure. Just make it a viking funeral.
make it using your hands
Yes. We had a black/brown pepple tec installed over our stained concrete pool and it does make the water a little warmer. Not significantly but noticeble enough to enjoy a quick dip.
The alcohol (or similar chemical) Kills the germs only.IT DOES NOT MAKE THEM CLEAN!
It turns the kinetic energy (moving your hands) into heat energy due to moving your hands faster.
There are a lot of nerve endings in your feet and hands so they are very likely to get cold. When, you warm them then your whole body will be warmer because they were the coldest part of your body.
friction
No, it will not.
a balnket is warmer than an odinary cloth
Rubbing your stomach makes it feel better because it helps you connect with your mental and physical senses.
Infrared Waves
If the water is room temperature, meaning the same temperature as the air, then you wouldn't feel a change in temperature. On the other hand, If there was a breeze or the air was otherwise in motion, it might increase evaporation of skin moisture and have a cooling effect. In that situation, putting your hands into the water might make them feel warmer.
Mechanical energy is changed to thermal energy. This is when you are rubbing your hands together to make heat.
You will feel warmer as you make out.
It will make the air humid, and so you may feel warmer.
If there's any benefit, it's psychosomatic.