Hi Welcome to HCM I have gone thru your your query regarding speedto select on tredmill and how much to walk . I appreciate your interest in in restarting & following regular exercise on treadmill . I would like to suggest you to consult a specialist to know the speed to select on tredmill and how much to walk . Nothing will help if you don t modify your life style and food habits . Regular Exercise is very essential along with healthy diet containing all essential nutrients as fiber ,vitamins , minerals , supplements full of antioxidents , in natural form --fruit ,green veges , lemon , ginger ,garlic , Aloe vera , Turmeric powder with hot milk etc,. Spices like cinnamon, black pepper etc. are good for losing weight and alley pains & help strengthening heart . Avoid processed foods carbs , sugar , fried ,fast foods , Tea , coffee ,alcohol and smoking , stress and Constipation all will produce biochemical and metabolic conditions in your body that will decrease your immunity, so avoiding is definitely the first step in the right direction to detoxing the body, boosting the immune system . I would like to suggest , you can include Yogic exercises from head to toe , like Pranayam - deep breathing , Kapalbhatti , Bhujangassan , Serp assan , Vajjarasan , Bhramari all and more will strengthen your back & vital parts , give you resistance from diseases and assure healthy happy life ahead . You can look for DVD of Baba Ram Dev,s yoga . they are available all over the World . It is suggested to consult a specialist for proper guidance . Hope this helps solves your query .Take care .All the best .Get well soon Don t hesitate to come back in case of any further query .