Any heart healthy tips for skinny people?!

Any heart healthy tips for skinny people?

I am 5'0 and i weigh 85 lbs and yes i am natuarlly skinny. I have had 2 heart transplants (one was cuz of a birth defect and the 2nd was cuz of scar build up over the years). Being skinny makes me not want to exercise so i am not up to par with exercising. I want to eat healthier and exercise more. my docs said it was ok as long as i dont fall out :p Does anyone have ne steps that help that will make me ease into eating and exercising? I have a treadmill, weight set it has like 3 or 4 functions, and an eliptical. So any tips would rock! ps my mom cooks.... lol

ill put your worried away..