Hard exertion quickly brings me to a point where I almost faint. This is a (side-)effect of the beta blockers, I suspect. They actively block your heart from e

Hard exertion quickly brings me to a point where I almost faint. This is a (side-)effect of the beta blockers, I suspect. They actively block your heart from exerting itself, which you would need for sustained physical activity. Beta-blockers are useful as a protective measure after heart surgery, but you can't build up your physique while on them.