What are some ways to prevent catching a cold from the kids?

I am a nanny of a 2 year old and 7mo old. The 2 year old is at the start of a cold (dry cough, runny nose) no fever, no chest congestion, happy little guy. I heard the baby coughing while she was sleeping, she has been feverish, but she just broke in 2 teeth the little trooper:) I dont want to catch it, as they wouldnt have someone to be with them, OR i we would all be miserable. I have been taking multivitamins and drinking lots of fluids. Airborne doesnt tend to work for me, i want to do more exercise , but after a 10 hour day with 2 young children, my legs ache, my back aches, im starving, begging for a shower, and just devote my time to my other half and MY babies (my 2 dogs) I need some suggestions! Any quick ideas on how to fit in quick exercised to make the difference?