How do you lift a patient's body from the floor?

The very best way is with a hoyer lift (place/roll the person onto a special sling that attaches to a lift; like a mini crane). If that is not available, then two people stand on either side of the person, hook their arm under the armpit of the patient/elderly person and lift. Be careful to keep your feet shoulder width apart and bend at the knees, not the waist or even the smallest elderly person can ruin your back.