Hello, had two mi's over 10yrs ago and no real problems. My work requires me to run a bleep test upto 5.7, I achieved 4.2 but cannot seem to get any further due to not being able to breathe. I am not exhausted by this exertion, just don't seem to have the oxygen to breath and continue further. I've had no surgery,only 2 angioplasty and treated with the following meds, nicorandil, antenolol, atorvistatin and ramipril.im generally quite fit and work long hours, do not want to push myself in case I over do it. I'm a 54yr old male, any advice would be appreciated with regards to achieving the 5.7 required.