thanks for your query.
is slightly high.
though the exercise done by you will not cause this high level.
you need to have serum CPK-MM level and total serum CPK.
again you need to exclude anemia
because anemia may cause this exertional fatiguability.
so please do your haemoglobin
and dont forget to check your BP on a regular basis. If not controlled properly you may have to add other medications to control it.
wish you good health.