One free hand

We are tool using people. There are no teeth or claws worth mentioning in regard to the animal kingdom and sometimes we need to remember this.
Hold a water bottle on your body using pressure from any limb and keep one arm free at all times. Move the bottle on your body using one or more limbs again with one arm free and repeat the drill while sitting and while moving between sitting and standing.
Have a partner try to take the bottle away and you avoiding it with your body and limb movements all while keeping one free hand.

The more we spread our awareness and common sense the better can we serve our families and friends and brothers in arms. For a soldier or policeman in a house search this can be the difference between life and death. For a father taking care of an infant it can be avoiding injury in his son and so on. The practice must be flexible to match the endless possibilities of what is happening now.