If they are extremely weak, and you have cured any illness - if their energy is low enough you can put them to bed. If not, you can have them relax in the hammock. Plus, if you have a treadmill, I have found that having them use it some will help increase their health. From the varied section of the store - fruits help them get healthier. I have one lady that went from extremely weak to very healthy in a couple days, by - walking on treadmill, eating fruits, using organic foods (more expensive, but a bit healthier foods). Give it time, you don't recover from extreme illness in an hour.