What is confinement and is it necessary?

Confinement really help if you strictly follows the rules, i have friends who doesn't follow the rules and regret now not following as they are facing problems like terrible back ache and slip disc in their back. Try not to touch water as much as possible. Dry up immediately if you touch water. I also cannot dont wash hair after a day, but my husband went to buy confinement dry powder shampoo for me to use during confinement.. I shower warm water alternate days or 3 days once, the days I didn't shower I will use a warm cloth to clean my body.. I still sleep in aircon room but not directly facing me, i cover up my body by wearing long sleeves..