CathyG, thanks for posting.
I have physical limitations from a car accident. I absolutely cannot do the heavy lifting, and probably not the sprints (maybe on a bike, but I'm not there yet). I can use resistance bands (I have a set at home). There are really good and gentle floor exercises for working your core, without doing crunches. Research some pilates exercises. So far, I workout several times a week for 15-30 minutes.
Because you are a newbie, you might want to begin with 15 minute walks. Maybe add a hill or a varied terrain, now and then. Slowly add minutes. Motion is lotion and regular movement, even 15 minutes, say 3-4 times a week really will help you.
Also, there are chair exercises. Please research! This is terrific way to burn some calories, especially if you have problems with your lower extremities.
Remember, exercise has other benefits, like improving your mood. That's a great motivator for me. Also, the energy boost I've gotten from eating Primal makes me want to move.
I've posted almost 40 mantras on the "Before and After Pics" thread on the success stories forum. Something as small as using a mantra can help to drown out the negative self talk. Also, support is huge. Thankfully there is lots of positive support here. A co-worker and I started this program together. We love giving each other tips about what's really good at the health food store, checking in about cheats and exercise. The accountability is nice. If you have a friend, family member or co-worker who is interested in better health, that could be a great source of support.
Get some DVD's to use during bad weather. Maybe you can check some out from your local library, to see what you like. I HIGHLY recommend Chi Gong (also spelled Qi Qong, Qi Kong). These are easy and gentle exercises that work your entire body. These ancient exercises are perfect for those for are recovering from illness/injury, or those, like you, who are just starting out. Emotionally, these exercises also make you feel great. You Tube is another good free source to try out different gentle exercises.
Mark just wrote about dancing. I have a friend who is very morbidly obese and she dances regularly and loves it. This is something free you can do at home. You don't have to jump; you can always keep on foot on the ground. I find a one or two song dance in my work office gives me any energy boost, too!
Also, regarding negative self talk, we all experience this. I just tell myself "it's just lizard brain talking and it never wants me to have fun. I'll show him!" There are all kinds of books and Webpages that discuss this topic. I read everything you can!
Please post again and let us know about any positive changes - no matter how small. Small victories are where it's at! Best to you.