Dr. Kohsy with FOX 2 talking about 21 Day Challenge Project kick off. Let's talk to Dr. Sindhu Koshy about the three steps, so it's three easy things and it begins with knowing your numbers. So, doctor what is the most important number for people to learn? "I think the most important number is probably blood pressure. It gives you an overall health marker and so that's probably the thing you want to ask your doctor to give you…