<s>[INST] I was diagnosed with about 80% heart arteries blockage several year ago. I walk every night about 1 mile on the treadmill. The past couple weeks, I have noticed my arms are aching and I have a pain between my shoulders. Also, my arms feel heavy. I do feel a bit out of breath. If I do stationary work outs, such as a bike and other machines at the gym, I feel okay. What does it mean? [/INST] Hi there. Welcome to Chat Doctor. I have read your query. You seem to be at risk of heart disease due to your previous history of heart artery blockage. Now you are having pain over upper body and limbs after exercising. Do you have any chest pain which occurs along with the breathlessness ? Any unusual sweating ? These could point to possible heart condition which needs to be ad Chat Doctor. Avoid stress and heavy exercising for now. Eat fresh fruits and green leafy vegetables.  </s>