I've been going to the gym nearly every single day for the last 2 years, I've gotten to the point where I could walk/run on the treadmill for an hour easily. However, after being diagnosed with some cardiac condition and being stuck on new medications I'm finding it difficult to make 30 minutes now. Does anyone have any advise on how to fight fatigue so you can make an hour again? It's like my legs are telling me enough is enough even though I'm not breathing hard at all.