Getting fit and healthy

My name is Darlene but like to be called Dar. I'm a 60 yr old lady who lost her husband going on 10 years now. My doctor told me about this site and I'm glad I joined. I'm also with Sparkpeople that is also free who wants to loose weight and a bunch of really nice friends.
Lately my lower back and left knee been bothern me so I do have to loose the weight.